| Subject | English | Irish |
| life.sc. | abiotic oxygen uptake | iontógáil aibitheach ocsaigine |
| met. | basic oxygen furnace | bunfhoirnéis ocsaigine |
| met. | basic oxygen furnace gas | gás foirnéise cruach ocsaigine |
| met. | basic oxygen steelmaking | déanamh cruach bunata le hocsaigin |
| environ. | biochemical oxygen demand The amount of oxygen used for biochemical oxidation by a unit volume of water at a given temperature and for a given time. BOD is an index of the degree of organic pollution in water | éileamh bithcheimiceach ar ocsaigin |
| nat.sc., environ., chem. | biochemical oxygen demand | éileamh bitheolaíoch ar ocsaigin |
| nat.sc., environ., chem. | biological oxygen demand | éileamh bitheolaíoch ar ocsaigin |
| life.sc. | chemical oxygen consumption | ídiú ceimiceach ocsaigine |
| environ. | chemical oxygen demand The quantity of oxygen used in biological and non-biological oxidation of materials in water; a measure of water quality | éileamh ceimiceach ar ocsaigin |
| environ., chem. | chemical oxygen demand | éileamh ceimiceach ar ocsaigin |
| lab.law., transp. | closed circuit oxygen equipment | trealamh ocsaigine le ciorcad iata |
| lab.law., transp. | constant flow oxygen equipment | trealamh soláthar leanúnach ocsaigine |
| lab.law., transp. | continuous flow oxygen equipment | trealamh soláthar leanúnach ocsaigine |
| med. | demand oxygen equipment | trealamh ocsaigine ar éileamh |
| med. | demand oxygen regulator | rialtán ocsaigine ar éileamh |
| med. | demand oxygen regulator | rialtán "ocsaigin ar éileamh" |
| environ. | dissolved oxygen The amount of oxygen dissolved in a stream, river or lake is an indication of the degree of health of the stream and its ability to support a balanced aquatic ecosystem. The oxygen comes from the atmosphere by solution and from photosynthesis of water plants. The maximum amount of oxygen that can be held in solution in a stream is termed the saturation concentration and, as it is a function of temperature, the greater the temperature, the less the saturation amount. The discharge of an organic waste to a stream imposes an oxygen demand on the stream. If there is an excessive amount of organic matter, the oxidation of waste by microorganisms will consume oxygen more rapidly than it can be replenished. When this happens, the dissolved oxygen is depleted and results in the death of the higher forms of life | ocsaigin tuaslagtha |
| environ., chem. | dissolved oxygen | ocsaigin thuaslagtha |
| environ., chem. | dissolved oxygen concentration | ocsaigin thuaslagtha |
| environ., chem. | electrochemical oxygen detector | braiteoir leictriceimiceach ocsaigine |
| environ., chem. | electrochemical oxygen sensor | braiteoir leictriceimiceach ocsaigine |
| transp. | emergency oxygen | ocsaigin éigeandála |
| transp. | emergency oxygen bottle | buidéal ocsaigine éigeandála |
| transp. | emergency oxygen system | córas ocsaigine éigeandála |
| environ. | molecular oxygen for black liquor oxidation | ocsaigin mhóilineach i gcomhair ocsaídiú licéir dhuibh |
| environ., chem. | oxygen analyzer | anailíseoir ocsaigine |
| chem. | oxygen compound | ocsaigionáit |
| chem. | oxygen compound | comhdhúil ocsaigine |
| environ. | oxygen content Amount of oxygen contained in a solution | ábhar ocsaigine |
| environ. | oxygen deficiency No definition needed | easpa ocsaigine |
| life.sc. | oxygen electrode | leictreoid ocsaigine |
| chem. | oxygen meter | méadar ocsaigine |
| med. | oxygen pressure demand regulator | rialtán ocsaigine ar éileamh |
| med. | oxygen pressure demand regulator | rialtán "ocsaigin ar éileamh" |
| environ. | oxygen sag curve | cuar an laghdaithe ocsaigine |
| gen. | oxygen sensor | braiteoir lambda |
| met. | oxygen steel furnace gas | gás foirnéise cruach ocsaigine |
| life.sc., chem. | theoretical oxygen demand | éileamh teoiriciúil ar ocsaigin |
| environ., chem. | zirconium oxide oxygen sensor | braiteoir ocsaigine ocsaíd siorcóiniam |