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oxygen

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oxygen
oxygen /ˈɒksɪdʒən $ ˈɑːk-/ noun [uncountable]
 Date: 1700-1800
 Language: French
 Origin: oxygène, from Greek oxys 'sharp, acid' + French -gène 'forming'; because it was believed that oxygen forms part of all acids
a gas that has no colour or smell, is present in air, and is necessary for most animals and plants to live. It is a chemical element: symbol O