(1) A nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
Borrowed from oxygène (originally in the form principe oxygène, a variant of principe oxigine ‘acidifying principle’, suggested by Lavoisier), from (oxus) sharp + (genos) birth, referring to oxygen's role in the formation of acids.
- A chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994.
- Molecular oxygen (O2), a colorless, odorless gas at room temperature.
- A mixture of oxygen and other gases, administered to a patient to help him or her to breathe.
- An atom of this element.