oxygen

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oxy|gen /'ɒksɪdʒən/
[N-UNCOUNT]
Oxygen is a colourless gas that exists in large quantities in the air. All plants and animals need oxygen in order to live.
The human brain needs to be without oxygen for only four minutes before permanent damage occurs.oxy|gen mask (oxygen masks)
[N-COUNT]
An oxygen mask is a device that is connected to a cylinder of oxygen by means of a tube. It is placed over the nose and mouth of someone who is having difficulty in breathing in order to help them breathe more easily.

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ablaze

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allowance

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