| Subject | English | Estonian |
| life.sc. | abiotic oxygen uptake | abiootiline hapniku omastamine |
| 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 | biokeemiline hapnikutarve |
| nat.sc., environ., chem. | biochemical oxygen demand | biokeemiline hapnikutarve |
| gen. | biochemical oxygen demand | bioloogiline hapnikutarve |
| nat.sc., environ., chem. | biological oxygen demand | biokeemiline hapnikutarve |
| gen. | biological oxygen demand | bioloogiline hapnikutarve |
| life.sc. | chemical oxygen consumption | keemiline hapnikutarve |
| environ. | chemical oxygen demand The quantity of oxygen used in biological and non-biological oxidation of materials in water; a measure of water quality | keemiline hapnikutarve |
| environ., chem. | chemical oxygen demand | keemiline hapnikutarve |
| environ., chem. | dissolved oxygen concentration | lahustunud hapnik |
| environ., chem. | dissolved oxygen concentration | lahustunud hapniku kontsentratsioon |
| environ., chem. | dissolved oxygen concentration | teraspea-lõhe |
| environ., chem. | dissolved-oxygen sag curve | hapnikusisalduskõver |
| environ. | oxygen content Amount of oxygen contained in a solution | hapnikusisaldus |
| environ. | oxygen deficiency No definition needed | hapnikupuudus |
| life.sc. | oxygen electrode | hapnikuandur |
| life.sc. | oxygen electrode | elektrokeemiline hapnikuandur |
| chem. | oxygen meter | hapnikumõõtur |
| environ., chem. | oxygen-sag curve | hapnikusisalduskõver |
| transp., environ., tech. | oxygen sensor | lambdaandur |
| gen. | oxygen sensor | liigõhuandur |
| life.sc., chem. | theoretical oxygen demand | teoreetiline hapnikutarve |