- A chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994.
- An atom of this element.
- Molecular oxygen (O2), a colorless, odorless gas at room temperature.
- (medicine) A mixture of oxygen and other gases, administered to a patient to help him or her to breathe.
Etymology: Borrowed from oxygène (originally in the form principe oxygène, a variant of principe oxigine "acidifying principle", suggested by w:Lavoisier, Lavoisier), from Ancient Greek (polytonic, á) (oxus) sharp + (polytonic, ) (genos) birth, referring to oxygen's role in the formation of acids.
- Dutch: zuurstof
- French: oxygène
- German: Sauerstoff
- Italian: ossigeno
- Spanish: oxígeno
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