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oxygen
noun (symbol O, atomic number 8) a colourless odourless tasteless gas which is an essential requirement of most forms of plant and animal life. It is the most abundant element in the Earth's crust (50%), and constitutes about 21% (by volume) of the Earth's atmosphere.
[18c: from French oxygène , ultimately from Greek oxys sharp or acid + gennaein to generate, from the old belief that all acids contained oxygen]
oxygenous adjective .
oxygen mask
noun a mask-like breathing apparatus that covers the nose and mouth, and is used to supply oxygen on demand, especially in rarefied atmospheres by mountaineers, aircraft passengers, etc.
oxygen tent
noun , med a tent-like apparatus into which a controllable supply of oxygen can be pumped, erected around the bed of a patient to aid their breathing.
oxygenate
verb (oxygenated , oxygenating ) to combine, treat, supply or enrich something (eg the blood) with oxygen.
[18c]
oxygenation noun .
oxygenator noun any apparatus that supplies oxygen, especially one that is used to oxygenate the blood outside the body during open heart surgery.
oxygenize or oxygenise
verb (oxygenized , oxygenizing ) to oxygenate.
[Early 19c]

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