a gas cylinder containing oxygen

the difference between the oxygen uptake of the body at rest and during exercise

(physics) A rare stable isotope of oxygen, ¹⁷₈O, having eight protons and nine neutrons; it amounts to 0.037% of the element in nature

(physics) A minor stable isotope of oxygen, ¹⁸₈O, having eight protons and ten neutrons; it amounts to about 0.2% of the element in nature

(physics) The major stable isotope of oxygen, ¹⁶₈O, having eight protons and eight neutrons; it amounts to over 99% of the element in nature

(physiology) Oxygen uptake per heartbeat at rest.

plural of oxygen tank

plural of oxygen thief

(chemistry) Condition of being saturated with oxygen. / (medicine) Proportion of oxygen-saturated hemoglobin in the blood.

The appearance of oxygen in the Earth's atmosphere, possibly as the result of the evolution of photosynthesis