- IPA: /ˈɒksɪʤən̩/
- 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 .
- ( medicine ) A mixture of oxygen and other gases, administered to a patient to help him or her to breathe .
- ( countable ) An atom of this element .
- liquid oxygen
- oxygen bar
- oxygen bottle
- oxygen cylinder
- oxygen debt
Borrowed from French oxygène ( originally in the form principe oxygène, a variant of principe oxigine ‘acidifying principle’, suggested by Lavoisier ), from Ancient Greek ὀξύς ( oxus, “sharp” ) + γένος ( genos, “birth” ), referring to oxygen's role in the formation of acids .
Explanation of oxygen by Wordnet Dictionary
- Oxygen n. [F. oxygène, from Gr. ὀξύς sharp, acid + root of γίγνεσθαι to be born. So called because originally supposed to be an essential part of every acid.]
1. ( Chem. ) A colorless, tasteless, odorless, gaseous element of atomic number 8, occurring in the free state in the atmosphere, of which it forms about 23 per cent by weight and about 21 per cent by volume, being slightly heavier than nitrogen. Symbol O. Atomic weight 15.9994.
☞ It occurs combined in immense quantities, forming eight ninths by weight of water, and probably one half by weight of the entire solid crust of the globe, being an ingredient of silica, the silicates, sulphates, carbonates, nitrates, etc. Oxygen combines with all elements ( except fluorine ), forming oxides, bases, oxyacid anhydrides, etc., the process in general being called oxidation, of which combustion is only an intense modification. At ordinary temperatures with most substances it is moderately active, but at higher temperatures it is one of the most violent and powerful chemical agents known. It is indispensable in respiration, and in general is the most universally active and efficient element. It may be prepared in the pure state by heating potassium chlorate.
This element ( called dephlogisticated air by Priestley ) was named oxygen by Lavoisier because he supposed it to be a constituent of all acids. This is not so in the case of a very few acids ( as hydrochloric, hydrobromic, hydric sulphide, etc. ), but these do contain elements analogous to oxygen in property and action. Moreover, the fact that most elements approach the nearer to acid qualities in proportion as they are combined with more oxygen, shows the great accuracy and breadth of Lavoisier's conception of its nature.
2. Chlorine used in bleaching. [Manufacturing name]
Definition of oxygen by GCIDE Dictionary