Oakland Bay bridge (Civ E.) droichead m1 Bhá Oakland

Oak Smoked, Gravlax and Hot Barbecue Smoked (Cu.) (of salmon) Dairdheataithe a, Gravlaks agus Deataithe Te ó Bheárbaiciú

oatmeal crispies (Cu.) brioscáin mpl mhine coirce

object s (Art.) rud m3, oibiacht f3

objection s (Adm., Tel.) agóid f2

objective s (Adm.) sprioc f2

objective lens (Astr., Sc.Eq.) réadlionsa m4

objectively a (Gen.) go hoibiachtúil a

objective of complaint (Com.) cuspóir m3 leis an ngearán

Objective 1 Status (Adm., Pol.) Stádas m1 Chuspóir 1

objective test items (Ed.) míreanna fpl tástála cuspóirí

objectivization s (Adm.) oibiachtúlú m (gs -laithe)

objectivization methods (Adm.) modhanna mpl oibiachtúlaithe

objectivize v (Adm.) oibiachtúlaigh v

objects spl (Astr.) réada mpl

obligations of membership (Adm.) oibleagáidí fpl comhaltais

oblique fault (Geol.) fiar-éasc m1

oblique view (Arch.) fiarchló m4

oblong-oval shell (MarBiol.) sliogán m1 ubhchruthach leathfhada

oboe d'amour (Mus.) óbó m4 d'amour (Hautbois d'amour)

obol s (Gk. civ.) (coin) óbal m1

obscurantism s (Hist., Phil.) diamhróireachas m1

observational method (Com.) modh m3 breathnadóireachta

observational skills (Art.) scileanna fpl

breathnadóireachta

observational work (Art., Ed.) obair f2

bhreathnadóireachta

observation pillar (Mapm.) cuaille m4 breathnadóireachta

Observation Short Stay Unit (Med.) Aonad m1 Coimhéadta Othar Gearrchónaithe

observation spot (Mapm.) ball m1 breathnadóireachta

observation terrace (Av.) ardán m1 breathnaithe, ardán féachana

observations spl (Astr.) breathnuithe mpl

observations spl (Ed., Lit.) tuairimí fpl

observatory s (Astr.) réadlann f2

observe v (Art., Astr., Ed..) breathnaigh v

observer s (Art., Astr., Ed.) breathnóir m3

observing s (Art., Ed..) breathnadóireacht f3

obsession s (PsyAn.) oibseisiún m1, Fam. dúghabháil f3

obsessional neurosis (PsyAn.) néaróis f2 dhúghabhálach

obsolete stock (Com.) stoc m1 críon

obsolete term (Term.) téarma m4 i léig

obstacle course (Sp.) bac-chúrsa m4

obstruction buoy (Mapm.) baoi m4 bacainne

obstruction light (Mapm.) solas m1 bacainne

Occitan s (Ling.) Ocatáinis f2

Occlo Huaco (Peruvian Myth.) Occlo Huaco

occlusal surface (Dent.) dromchla m4 greama

occlusive dressing (Med.) cóiriú m oclúideach

occult s (Lib., Lit.) briotais f2

occupational a (Ed., Health, etc.) ceirde gs as a; saothair gs as a; gairme gs as a; oibre gs as a; ag an obair, gairm- pref

occupational guidance (Ed.) gairmthreoir f5

Occupational Health Service (Health, Med.) Seirbhís f2 Sláinte Saothair

occupational hygiene (Health) sláinteachas m1 oibre

occupational immobility (Com.) do-aistritheacht f3 ghairme (nó ó phost go chéile)

occupational information (Adm.) eolas m1 gairme

occupational injuries fund (Adm., Fin.) ciste m4 díobhálacha ceirde

occupational injury (Adm.,Health) díobháil f3 cheirde

occupational mobility (Com.) so-aistritheacht f3 ghairme (nó ó phost go chéile)

occupational mobility of labour (Com.) so-aistritheacht f3 ghairme lucht saothair/oibre

occupational prestige (Com., Psy.) gradam m1 gairme

occupational programme (Health, Med.) clár m1 saothair

occupational psychology (Psy.) gairmshíceolaíocht f3

occupational pyramid (Adm., Com.) pirimid f2 slite beatha

occupational safety (Health, Saf.) sábháilteacht f3 cheirde

occupational structure (Adm., Com.) struchtúr m1 slite beatha

occupational survey (Adm., Ed.) suirbhé m4 gairme(acha)

occupational tests (Adm., Ed.) trialacha fpl gairme

occupational therapist (Med.) teiripeoir m3 saothair

occupational therapy (Med.) teiripe f4 shaothair

ocean currents (Geog.) feachtanna mpl aigéin

ocean management (Geog.) bainistíocht f3 an aigéin

ocean ridge (Geog.) droim m3 aigéin

ocean trench (Geog.) trinse m4 aigéin

ocean waters (Geog.) uiscí mpl na n-aigéan

ochratoxin s (Biol.) ócratocsain f2

ochre a (Geol.) ócair gs as a

Ochroelchia parella (MarBiol.) (lichen) Ochroelchia parella

octavo s (Lib.) ochtábhó m4

octylenglykol s (Ch.) ochtailéingliocól m1

octylphenol s (Ch.) ochtailfeanól m1

ocular lens (Opt.) (of microscope) súil-lionsa m4; lionsa m4 súilí

odd leg calipers (= jenny) (Ph.) cailpéar m1 corrchosach

Odessa s (Geog.) Odessa

Odin s (Scandinavian Myth.) Óidin m4

odometer s (Ph.) odaiméadar m1

Odysseus s (Gk. Myth.) Odaiséas m1

Odyssey s (Lit.) Odaisé f4

Oechalia s (Geog., Gk. Myth.) An Éacail f2

Oedipus complex (PsyAn.) coimpléasc m1 Éideapúis

Oeneus s (Gk. Myth.) Éinéas m1

off a (El.) múchta a, as a

off- pref (Col.) neas- pref

off-cut s (Hort.) gearrthán m1

offer s (Com.) tairiscint f2

offeree s (Com.) (person receiving offer) tairgí m4

office administration (Adm., Com.) riarachán m1 oifige

office bureau (Adm., Com.) biúró m4 oifige

Office of Public Works (Adm.) Oifig f2 na nOibreacha Poiblí

Office of the Chief Medical Officer (Adm., Med.) Oifig f2 an Phríomh-Dhochtúra

Office of the Data Protection Commissioner (Adm.) Oifig f2 an Choimisinéara Cosanta Sonraí

Office of the Director of Telecommunications and Radio (Broadc., Tel.) Oifig f2 an Stiúrthóra Teileachumarsáide agus Raidió

Office of the Director of Telecommunications Regulation (ODTR) (Broadc., Tel.) Oifig f2 Stiúrthóir Rialú na Teileachumarsáide

Office of the Permanent Secretary (Adm.) Oifig f2 an Ard-Rúnaí

official notebook (Polic.) leabhar m1 nótaí oifigiúil

official publication (Lib.) foilseachán m1 oifigiúil

off-licence proprietor (Ret.) úinéir m3 (siopa) eischeadúnais

off-line a (Comp.) as líne

offload v (Com.) (of shares) scar v go pras (le scaireanna)

offloading s (Com.) (of shares) scaradh m go pras (le scaireanna)

off-peak hours (Tel.) uaireanta fpl seachbhuaice

off-print s (Lib.) seach-chló m4

offshore oil-gas exploitation platform (Mapm.) ardán m1 saothraithe ola agus gáis ar muir

off-site settings (Ed.) ionaid mpl lasmuigh de láthair an choláiste

off-site storage (Lib.) stóráil f3 sheachtrach

off the bit (Sp.: HorseRac.) (é a scaoileadh) dá araíonacha

off the job training (Adm., Ed.) oiliúint f3 ar láthair eile

off-white a (Col.) neasbhán a

ogham feather mark (Comp.) (font) comhartha m4 oghaim eite

ogham lacuna mark (Comp.) (font) comhartha m4 oghaim bearna

ogham letter Ailm (Comp.) (font) litir f5 oghaim Ailm

ogham letter Beith (Comp.) (font) litir f5 oghaim Beith

ogham letter Ceirt (Comp.) (font) litir f5 oghaim Ceirt

ogham letter Coll (Comp.) (font) litir f5 oghaim Coll

ogham letter Dair (Comp.) (font) litir f5 oghaim Dair

ogham letter Éabhadh (Comp.) (font) litir f5 oghaim Éabhadh

ogham letter Eadhadh (Comp.) (font) litir f5 oghaim Eadhadh

ogham letter Eamhancholl (Comp.) (font) litir f5 oghaim Eamhancholl

ogham letter Fearn (Comp.) (font) litir f5 oghaim Fearn

ogham letter Gort (Comp.) (font) litir f5 oghaim Gort

ogham letter Ifín (Comp.) (font) litir f5 oghaim Ifín

ogham letter Iodhadh (Comp.) (font) litir f5 oghaim Iodhadh

ogham letter Luis (Comp.) (font) litir f5 oghaim Luis

ogham letter Muin (Comp.) (font) litir f5 oghaim Muin

ogham letter nGéadal (Comp.) (font) litir f5 oghaim nGéadal

ogham letter Nion (Comp.) (font) litir f5 oghaim Nion

ogham letter Onn (Comp.) (font) litir f5 oghaim Onn

ogham letter Ór (Comp.) (font) litir f5 oghaim Ór

ogham letter Peith (Comp.) (font) litir f5 oghaim Peith

ogham letter Ruis (Comp.) (font) litir f5 oghaim Ruis

ogham letter Sail (Comp.) (font) litir f5 oghaim Sail

ogham letter Straif (Comp.) (font) litir f5 oghaim Straif

ogham letter Tinne (Comp.) (font) litir f5 oghaim Tinne

ogham letter Uath (Comp.) (font) litir f5 oghaim Uath

ogham letter Uilleann (Comp.) (font) litir f5 oghaim Uilleann

ogham letter Úr (Comp.) (font) litir f5 oghaim Úr

ogham reversed feather mark (Comp.) (font) comhartha m4 oghaim eite thuathail

ogham space mark (Comp.) (font) comhartha m4 oghaim spás

ohm scale (El.) scála m4 óm

oil s (Geol.) ola f4

oil-based a (Decor.) (of paint) olabhunach a

oil boom (Com.) sail f2 bharra ola

Oil Control Foundation (Cosmet.) Bonnsmideadh m1 Rialaithe Ola

oil crops (Agr., Geog.) barra mpl ola

oiled a (Env.) (of birds, etc.) smeartha a (le hola)

oil gland (Biol.) faireog f2 ola

oil jetty (Env., Ind.) lamairne m4 ola

oil of evening primrose (Health) ola f4 choinnle oíche

oil pipeline (Ind., Mapm.) píblíne m4 ola

oilseeds spl (Agr., Geog.) síolta mpl ola

oil slick (Env.) leo m4 ola

oil tank (Mapm.) dabhach m1 stórála ola

oil tanker (Transp.) tancaer m1 ola

oil terminal (Env., Ind.) críochfort m1 ola

Old Baal's Bridge (Geog.) Droichead m1 Maol Luimnigh

Old English black and tan terrier (Z.) brocaire m4 gallda dúchrón

Old English sheepdog (Z.) sípéir m3 gallda

Old English terrier (Z.) brocaire m4 gallda

older (obsolescent) symbols (Mapm.) seansiombailí fpl

Old Kingdom, the (Egypt. Myth.) an tSean-Ríocht f3

olearia s (Bot.) oiléiria f4

oleoresinous a (Bot.) olaroisíneach a

oligotrophic a (Bot.) olagatrófach a

olivaceous warbler (Hippolais pallida) (Orn.) ceolaire m4 bánlíoch

olive-backed pipit (Anthus hodgsoni) (Orn.) riabhóg f2 dhroimghlas

olive croutons (Cu.) croutons olóige

olive-green a (Col.) glasbhuí a

olive-grey a (Col.) glasliath a

olive grove (Mapm.) garrán m1 ológ

olive oil (Cu.) (olio di oliva) ola f4 olóige

olive- or yellowish-green (Col.) buíghlas a

olive pomace oil (Cu.) (olio de sansa di oliva) ola f4 phrabhaite olóige

olivine-gabbro s (Geol.) olaivínghabró m4

olla volute (MarBiol.) measra m4 toinne

Olmecs spl (Geog.) na hOilmicigh mpl

Olympia s (Geog.) Oilimpia f4

Olympus s (Gk. Myth.) Oilimpeas m4

omasum s (= manyplies, psalterium) (Z.) omasam m1, goile m4 duilleach, goile an leabhair, mála m4 an leabhair

Ombudsman s (Adm., Jur.) Ombudsman m1 (pl -main), Fear m1 an Phobail

omega s (Gk. letter) óimige f4

omicron s (Gk. letter) oimeacrón m1

Omphale, queen of Lydia (Gk. Myth.) Omfailé f4, banríon Lidia

on-air studio (Broadc.) stiúideo m4 ar an aer

on/off button (El.) cnaipe m4 ann/as

on/off switch (El.) lasc f2 ann/as

once-off events (Gen.) teagmhais mpl aon uaire

once-off job (Adm.) saothar m1 (na h)aon uaire

oncology s (Med.) oinceolaíocht f3

oncoming traffic (RoadSaf.) trácht m3 tulghluaiseachta; Fam. trácht m3 i d'aghaidh

on demand (Com.) ar éileamh

on disk (Comp., IT) (recorded on disk) ar diosca

on disk (Comp., IT) (particular reference, on a disk) ar dhiosca

on duty (Polic.) ar dualgas

one-arm restraint (Wat.Saf.) srian m1 aon láimhe

one-person operator (OPO) bus (Mec.) bus m4 aon-oibreora

one point perspective (Art.) peirspictíocht f3 aon phointe

one-stop shop (Ret.) ionad m1 ilfhreastail

one-stop shopping (Com.) siopadóireacht f3 aon ionaid

one-to-one (Ed.) (of teaching) duine m4 le duine

one-up-manship s (Gen.) sáraíocht f3

One Year Certificate in Applied Social Studies in Counselling (Ed.) Teastas m1 Cúrsa Bliana Staidéir Shóisialta Fheidhmigh sa Chomhairleoireacht

One Year Certificate in Business Law (Ed.) Teastas m1 Cúrsa Bliana i nDlí Gnó

One Year Certificate in Business Studies in Trade Union Studies (Ed.) Teastas m1 Cúrsa Bliana Staidéir Ghnó i Staidéar Ceardchumainn

One Year Certificate in Management and Employee Relations (Ed.) Teastas m1 Cúrsa Bliana i gCaidreamh idir Lucht Bainistíochta agus Fostaithe

One Year Certificate in Office Administration (Ed.) Teastas m1 Cúrsa Bliana i Riarachán Oifige

One Year Certificate in Supervisory Management (Ed.) Teastas m1 Cúrsa Bliana i mBainistíocht do Mhaoirseoirí

One-year Certificate in Science in Healthcare Informatics (Ed.) Teastas m1 Bliana Eolaíochta i bhFaisnéisíocht Chúraim Shláinte

on fiche (Lib.) ar fís

ongoing civilianisation policy (Polic.) polasaí m4 leanúnach sibhialaithe

onion rings (Cu.) fáinní mpl oinniún

onka s (Inc. civ.) (tunic) onka

on-line a (Comp.) ar líne

on-line bibliographic database (Lib.) bunachar m1 sonraí bibleagrafaíocha ar líne

on-line image browser (Comp.) brabhsálaí m4 íomhánna ar líne

on-line literature searching (Comp., Lib.) cuardach m1 (ar) litríochta ar líne

on-line public-access catalogue (Comp., Lib.) catalóg f2 ar líne don phobal

on-line searching (Comp.) cuardach m1 ar líne

on loan (Lib.) ar iasacht

onshore a (Geog.) ar an gcladach/ faoin gcladach

on tape (IT, Mus.) (recorded on tape) ar téip

on tape (IT, Mus.) (particular reference, on a tape) ar théip

on the bridle (Sp.: HorseRac.) ar a araíonacha

on the job training (Adm., Ed.) oiliúint f3 ar an láthair

On the Revolution of the Heavenly Spheres (Hist., Lit.) I dtaobh Imrothlú m na Sféar Neimhe

ontogenetic a (Biol.) ontaiginiteach a

Oort cloud (Astr.) scamall m1 Oort

ootheca s (Biol.) úitiach f2

opal wax (Min.) céir f5 ópalach

op art (Art.) op-ealaín f2, ealaín optúil

OPEC (= Organisation of Petroleum Exporting Countries) (Com.) ETOP

open access (Lib.) rochtain f3 oscailte

open activity (Ed.) gníomhaíocht f3 oscailte

open-air acoustics (Tel.) fuaimíocht f3 faoin aer

open-cast extraction (Min.) eastóscadh m dromchla

open day (Ed.) lá m oscailte

open-field strip farming (Agr., Hist.) feirmeoireacht f3 straidhpeanna oscailte

open freezing (HomEc.) reo m4 oscailte

opening balance (Com.) iarmhéid m4 tosaigh

opening statement (Com.) ráiteas m1 tosaigh

opening times (Com., Gen.) uaireanta fpl oscailte

open learning centre (Ed.) ionad m1 foghlama oscailte

open pit (Mapm., Min.) clais f2 dromchla

open-pit extraction (Min.) eastóscadh m claise oscailte

open questioning (Ed.) ceistiú m oscailte

open reel (Lib.) spól m1 oscailte

open season order (Adm., Sp.) ordú m séasúir oscailte

open setting (Geog.) suíomh m1 oscailte

open submissions (Adm., Polic.) aighneachtaí fpl oscailte

open universe (Astr.) cruinne f4 oscailte

open weave (Art., Tex.) fí f4 oscailte

open-weave fabric (Cloth., Tex.) fabraic f2 fí oscailte

open wire (Tel.) sreang f2 oscailte

opera s (Mus., Th.) ceoldráma m4, opera

Opera House (Geog.) (in Sydney) Opera House (An tÁras Ceoldrámaíochta; áras ceoldrámaíochta Sidney)

operate a criminal cartel, to (Polic.) cairtéal m1 coiriúil a oibriú

operatic a (Mus.) ceoldrámata a

operating cap (= theatre cap) (Med.) bairéad m1 obrádlainne

operating control (Tel.) rialtán m1 oibriúcháin

operating drape (Med.) fallaing f2 obrádlainne

operating hood (Med.) húda m4 obrádlainne

operating profits (Com.) brabúis mpl oibriúcháin

operating rocker (Metal.) luascaire m4 oibrithe

operating table (Med.) bord m4 obráide

operating theatre (Med.) obrádlann f2

operation s (Polic.) (of event) oibríocht f3

operation s (Tel.) (of process) oibriú m (gs -rithe), oibriúchán m1

operation (come into) (Tel.) teacht i bhfeidhm

operational budget (Polic.) buiséad m1 oibriúcháin

operational direction (Polic.) treo m4 oibriúcháin

operational priority (Polic.) tosaíocht f3 oibriúcháin

Operational Programme for Tourism (Tour.) An Clár m1 Oibriúcháin do Thurasóireacht

Operation Freeflow (Polic.) Oibríocht f3 an tSaorshreafa

Operation Lifesaver (Polic.) Oibríocht f3 na Tarrthála

operation succeeded (Comp.) oibríocht f3 i gcrích

operator s (Tel.) oibritheoir m3

operator service (Tel.) seirbhís f2 oibritheora

operculum s (MarBiol.) (of mollusc) clúidín m4

Opet festival (Egypt. Myth.) féile f4 Ópait

ophthalmic cotton (Med.) cadás m1 oftalmach

ophthalmic swab (= eye stick) (Med.) maipín m4 súile

opinion s (Ed., Gen.) tuairim f2

opinion former (Journ., Soc.) múnlóir m3 meoin, pl lucht m3 múnlaithe meoin, múnlóirí mpl meoin

opinion poll (Journ.) pobalmheas m3

Opium War (Chin. hist.) Cogadh m1 an Óipiam

opposite a (El.) (of charge) urchomhaireach a

optical bleach (Med.) tuarthóir m3 optúil

optical character reading (Comp, Lib.) léamh m1 optúil carachtar

optical disk (Comp, Lib.) diosca m4 optúil

optical fibres (Tel.) snáithíní mpl optaice

optical mixing (Opt.) cumasc m1 optúil

optical sight (Weap.) (of rifle) treoir f5 shúile

optician s (Med.) radharceolaí m4

optimiser s (Tel.) optamóir m3

optimum carrying capacity (Geog.) (of land to carry population) acmhainn f2 cothaithe

optimum utilization (Gen.) an úsáid is fearr is féidir

opting out principle (Com.) prionsabal m1 an diúltaithe

option s (Com., Comp.) rogha f4

option look-alike (Com.) amhlachas m1 rogha

option use value (Com.) luach m3 úsáide roghnaí

opt-out s (Legis.) rogha f4 an diúltaithe

Oracle at Delphi (Greek Myth.) Aitheascal m1 Dheilfe

oral complaint (Com.) gearán m1 ó bhéal

oral eroticism (PsyAn.) earótachas m1 béil

oral format (Ed.) leagan m1 ó bhéal

oral history (Ed.) stair f2 bhéil

oral phase (= oral stage) (PsyAn.) tréimhse f4 béil

oral polio booster (Med.) teanndáileog f2 bhéil polaimiailítis

oral-sadistic phase (= oral-sadistic stage) (PsyAn.) tréimhse f4 shádach béil

oral sex (Sex.) gnéas m1 béil

oral stage (= oral phase) (PsyAn.) tréimhse f4 béil

orange a (Col.) flannbhuí a

orange balsam (Impatiens capensis) (Bot.) balsaimín m4 flannbhuí

orange brown (Col.) cróchdhonn a

orange leafy lichen (Xanthoria sp.) (MarBiol.) léicean m1 duilleach flannbhuí

orange lichen (Caloplaca sp.) (MarBiol.) léicean m1 flannbhuí

orange poison arrow frog (Z.) frog m1 oráisteach saigheadnimhe

orange-red a (Col.) cróchdhearg a

orange-tip s (Ent.) (Anthocharis cardamines) bánóg f2 rinnbhuí

orange-yellow a (Col.) cróchbhuí a

oratory s (Archaeol., Relig.) aireagal m1

orbital inclination (Astr.) claonadh m na fithise

orbital (2p, 3p_x etc.) (Astr.) fithiseán m1 2p, fithiseán 3p_x

orbital workshop (AstrPh.) saotharlann f2 spáis

orb-shell cockle (Sphaerium corneum) (MarBiol.) ruacan m1 cruinneánach

orchard a (Hort.) úllord m1

order s (Tel.) (command, requisition etc.) ordú m (gs –daithe)

order s (Tel.) (sequence) ord m1

order form (Lib.) foirm f2 ordaithe

orderliness s (PsyAn.) ordúlacht f3

Order of Malta (Med., Soc.) Ord m1 Mhálta

order of merit (Adm.) ord m fiúntais

ordinary crime (Polic.) gnáthchoireacht f3 /gnáthchoireanna fpl

ordinary level (Ed.) (of school course) gnáthleibhéal m1

ordinary pc (= normal pc) (Constr.) gnáthstroighin f2 Portland

ore s (Geol.) mian f2 (gs méine pl mianta)

orejon s (Inc. civ.) orejon m4

ore mine (Geol., Min.) mianach m1 méine

Ore Mountains (= Erzgebirge) (Geog.) Sléibhte mpl Ore

orexin-A s (BioCh.) oireicsin-A f2

orfe s (Leuciscus idus) (Ich.) orfa m4

organ donor (Med.) deontóir m3 orgáin

organic farming (Agr., Hort.) feirmeoireacht f3 orgánach

organic food (Hort.) bia m4 orgánach

organic gardening (Bot., Hort.) garraíodóireacht f3 orgánach

organics spl (Hort.) orgánaic f2

organigram s (Adm.) eagraghram m1

organisation s (Adm.) (of body) eagraíocht f3

organisation s (Adm.) (of process) eagrú m (gs –raithe, eagrúchán m1)

Organisation and Management Division (includes Freedom of Information Unit) (Adm.) An Rannóg f2 Bainistíochta agus Eagrúcháin (an tAonad um Shaoráil Faisnéise san áireamh)

organisation development (Polic.) forbairt f3 eagraíochta

Organisation of European Space Research, The (Astr.) An Eagraíocht f2 Eorpach um Spásthaighde

Organisation of Petroleum Exporting Countries (OPEC) (Adm.) Eagraíocht f3 na dTíortha Onnmhairithe Peitriliam

Organisation Unit (Adm.) An tAonad m1 Eagrúcháin

organisational slack (Polic.) mairbhití f4 eagrúcháin

organisational theory (Adm.) teoiric f2 an eagrúcháin

organised crime penetration (Polic.) fáil f3 isteach i measc coirpeach eagraithe

organochlorine s (Ch.) orgánaclóirín m4

organoleptic a (Biol.) orgánaileipteach a

organophosphorus s (Ch.) orgánafosfar m1

organostannic compound (Ch.) comhdhúil f2 orgánastánach

orgasm s (Physiol.) súnás m1

O rhesus positive (Med.) (blood-group) O rhesus deimhneach

oriental plane (Platanus orientalis) (Bot.) plána m4 oirthearach

oriental spruce (Picea orientalis) (Bot.) sprús m1 oirthearach

orientation s (Arch.) treoshuíomh m1

original edition (Lib.) buneagrán m1

original painting (Art.) bunphéintéireacht f3, péintéireacht f3 bhunaidh

original text (Lib.) buntéacs m4

originator's number (Com.) (of direct debit) uimhir f5 an tionscnóra

origin of the universe (Hist., Astr.) bunús m1 na cruinne

Orion s (Astr.) Oiríon m4, An Bodach m1

Orion arm (Astr.) géag f2 Oiríon

Orion association (Astr.) comhcheangal m1 Oiríon

Orionids spl (Astr.) Oirínidí fpl

Orion nebula (= Great Nebula in Orion,

M42) (Astr.) Réaltnéal m1 Oiríon, buaile f4 an Bhodaigh

Orion's belt (= Belt of Orion, Hunter's Belt) (Astr.) Crios m3 Oiríon, an Fhearsaid f2, An Bhanlámh f2, slat f2 an Rí, slat f2 an Bhodaigh, slat f2 an Cheannaí

Orion's Sword (Astr.) Claíomh m1 Oiríon, An tSlat f2

orlon s (Cloth.) orlón m1

ormer s (= abalone) (Haliotis tuberculata, Discus hannai) (MarBiol.) cluas f2 mhara

ornamental initial (Lib.) iniseal m1 maisithe

ornamental leather (Lib.) leathar m1 maisithe

ornamental masonry (Arch., Art.) máisiúnacht f3 ornáideach

orographic cloud (Geog.) scamall m1 oragrafach

orosurgery s (Med.) máinliacht f3 béil

orthoclinal mountains (Geol.) sléibhte mpl ortachlaonasacha

orthopaedics spl (Med.) ortaipéidic f2

orthopaedy s (Med.) ortaipéide f4

Orthrus s (Gk. Myth.) Ortras m1

ortolan bunting (Emberiza hortulana) (Orn.) gealóg f2 gharraí

oscillator s (Ph.) ascaltóir m3

Osiris s (Egyptian Myth.) Óisíris m4

Ossetia (Geog.) An Óiséit f2

osteochondritis s (Med.) oistéacoindríteas m1

osteomalacia s (Med.) oistéamalaice m4

osteopathy s (Med.) oistéapaite f4

osteoporosis s (Med.) oistéapóróis f2

other (specify exact category) (Comp.) eile (sainigh an aicme chruinn)

other areas of high crime (Polic.) ceantair mpl eile ardchoireachta

Other facilities available in Gurteen Agricultural College (Ed.) Saoráidí fpl Eile ar fáil i gColáiste Talmhaíochta Ghoirtín

other requests (Adm., Gen.) iarratais mpl eile

Other World (Myth.) an saol m1 eile

oto-acoustic a (Physiol.) otafhuaimiúil a

otter shell (MarBiol.) breallach m1 dobharchú

otterhound s (Z.) madra m4 dobharchú

our own music awards (Leis., Mus.) ár ndámhachtainí fpl ceoil féin; ár nduaiseanna fpl ceoil féin

outfielder (Sp.: Baseball) ceapadóir m3 amuigh

out of phase (Tel.) as comhphas

out of print (Lib.) as cló

out of school educational activity (Ed.) gníomhaíocht f3 oideachasúil lasmuigh den scoil

out of stock (Lib.) as stoc

out of the money (Com.) as an airgead

outages spl (Tel.) bristeacha mpl

outboard processing (Mus.) (of equipment) seachphróiseáil f3

outbreeding s (Biol.) easphórú m (gs –raithe)

outbuildings spl (Agr.) tithe mpl amuigh

outburst s (Astr.) rois f2

outdated a (Gen.) (of system) as dáta

outdoor environments (Art.) timpeallachtaí fpl lasmuigh

outer bailey (Arch., Hist.) bábhún m1 lasmuigh

outer space (Geog., Ph.) an spás m1 amuigh

outerwear s (Cloth.) éadaí mpl amuigh

outfall pipe (Mapm.) píobán m1 sceite

outflow s (Com.) eis-sreabhadh m (gs –reafa), airgead m1 amach

outgoing lines (Tel.) línte fpl amach

outgrowth s (Hort.) fiafhás m1

outline drawing (Art.) léaráid f2 imlíneach

outline permission (Env.) cead m3 imlíneach

outline plan (Ed.) sracphlean m1

outlines spl (Art., Gen.) imlínte fpl

out-of-class study (Ed.) staidéar m1 lasmuigh den rang

Outpatient Department (Med.) Rannóg f2 na nOthar Seachtrach

Outpatients' Reception (Med.) Fáiltiú m Rannóg na nOthar Seachtrach

output s (Comp.) aschur m1

output s (Com.) (production) táirgeacht f3

output circuit (Tel.) ciorcad m1 aschuir

outreach s (Lib., Soc.) for-rochtain f3

outrigger wheel (Av.) roth m3 athchabhlach

outside a (Gen.) seachtrach a

outside broadcast (Broadc., Tel.) craoladh m seachtrach

outside broadcast lines (Broadc., Tel.) craol-línte fpl seachtracha

outside calipers (Ph.) cailpéar m1 seachtrach

outside entrance door (Adm.) doras m1 isteach (ón taobh amuigh)

outsizes spl (Cloth.) mórthomhais mpl

outsourcing s (Com.) foinsiú m allamuigh

outstanding appeals (Polic.) achomhairc mpl fós gan éisteacht

outstrip recruiting, to (Adm., Gen.) dul thar an líon a earcaíodh

outwash deposit (Geol.) spré-shil-leagan m1

outwash fan (Geol.) spré-fhean m4

oval piddock (MarBiol.) pideog f2 ubhchruthach

oval Venus (MarBiol.) maighdeog f2 ubhchruthach

ovenbird s (Seiurus aurocapillus) (Orn.) éan m1 oighinn

oven cleaner (HomEc.) glantóir m3 oighinn

overexploitation s (Geog.) róshaothrú m (gs –raithe)

Overall Budgetary Policy (Fin., Pol.) Beartas m1 Foriomlán Buiséadach

overall cost leadership (Com.) ceannaireacht f3 fhoriomlán costais

Overall EMU Policy (Fin., Pol.) Beartas m1 Foriomlán an AEA

overall figure of 2 cases in hand, it gave an (Polic.) d'fhág sin figiúr iomlán de 2 chás idir lámha

overall frequency characteristic (Tel.) sainchuar m1 comhiomlán minicíochta

overall impact of corporate strategy plan (Adm., Com.) tionchar m1 foriomlán an phlean chorparáidigh straitéise

overall outline (Ed.) éirim f2 ghinearálta

overamplified a (Mus.) ró-aimplithe a

overarching objectives (Adm.) cuspóirí mpl uileghabhálacha

overarm a (Sp.) os cionn láimhe

overbound city (Geog.) cnuasach m1 cathracha

overburden s (Geol.) forchlúdach m1

overcast s (Com.) ró-áireamh m1

over-consumption s (Env.) ró-thomhaltas m1

overdue a (Lib.) thar téarma

overdue notice (Lib.) fógra m4 thar téarma

overfalls spl (= tide rips) (Mapm.) cuilitheáil f3

overfishing s (Geog.) ró-iascaireacht f3

overflight arrangements (Av., Polic.) socraithe mpl traseitilte

overflow can (Sc. Eq.) canna m4 sceite

overgrowth s (Geol.) imfhás m1

overhanging roof (Arch., Constr.) díon m1 ag gobadh amach thar an mballa

overhead cable (El.) cábla m4 lasnairde

overhead electric cable (El.) cábla m4 leictreach asnairde

overhead light (El.) solas m1 anuas

overhead pass (Sp.) pas m4 lasnairde

overhead projector (Ed., Lib.) osteilgeoir m3

overheads spl (Com., Fin.) forchostais mpl

overhead transporter (Mapm.) iompróir m3 lasnairde

overhead view (Geog.) radharc m1 ón taobh thuas

overheating s (Com.) (in housing market) róbhorradh m (sa mhargadh tithíochta)

overland trade (Com.) trádáil f3 thar tír

overlap s (Tel.) forluí m4

overlap v (Tel.) forluigh v

overlapping s (Art.) forluí m4

overload s (Tel.) forualach m1

overload v (Tel.) forualaigh v

overloading s (El.) (of electric circuit) ró-ualú m (gs –laithe)

overlocker s (Cloth.) barrchríochnóir m3, tarfhuálaí m4

overmanning s (Adm.) rólíon m1 foirne

overnight v (Com.) babhtáil f3 thar oíche

over-revving s (RoadSaf., Veh.) ró-reibheáil f3

overseas surface mail (Adm., Post.) post m1 de mhuir is de thalamh

oversize book (Lib.) leabhar m1 mórthomhais

overtaking lane (RoadSaf.) lána m4 scoite

overtime s (Adm.) ragobair f2

overview s (Ed.) (of curriculum etc.) forbhreathnú m (ar churaclam)

overwinter v (Env.) an geimhreadh m1 a chaitheamh

ovists s (Biol.) ubhánaithe mpl

ownership of property (Com.) úinéireacht f3

maoine

oxidant s (Ch.) ocsaídeán m1

oxides of nitrogen (Ch.) ocsaídí fpl de nítrigin

oxlip s (Primula elatior) (Bot.) baisleach m1

oxygen s (Ch.) ocsaigin f2

oxygenate s (Ch.) ocsaigionáit f2

oxygen tent (Med.) puball m1 ocsaigine

oxygen tube (Sp.: Div.) píobán m1 ocsaigine

oyster bed (MarBiol.) beirtreach f2

oyster drill (MarBiol.) tarathar m1 oisre

oyster fungus (Pleurotus ostreatus) (MarBiol.) arc m1 oisreach

oyster mariculture (MarBiol.) muirshaothrú m oisrí

oyster mushroom (Cu., Hort.) beacán m1 oisreach

ozalid s (Print.) osailid f2

ozocerite s (= ozokerite) (Ch.) ózaiceirít f2

ozokerite s (= ozocerite) (Ch.) ózaiceirít f2

ozone s (Ch.) ózón m1

ozone depletion potential (ODP) (Ch.) acmhainn f2 ídithe ózóin

ozone hole (Env.) poll m1 ózóin, poll m1 san ózón

ozone layer (= ozonosphere) (Ch., Env.) ciseal m1 ózóin, ózónaisféar m1, F: crios m3 ózóin