oxygen

US /ˈɑksɪdʒən/

UK /'ɒksɪdʒən/

B1
n. (u.)Uncountable NounA gas in the air that we need to breathe
He could not breathe so they gave him oxygen
n. (u.)Uncountable NounOxygen administered as a medical treatment.
The patient was given oxygen to help him breathe.

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