Longman Dictionary of Contemporary English - oxygen mask
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Oxygen mask
oxygen mask
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1.
(oxygen masks) 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 breath more easily. N-COUNT ...Collins COBUILD Advanced Learner's English Dictionary
2.
noun Date: 1920 a device worn over the nose and mouth through which oxygen is supplied from a storage tank ...Merriam-Webster Collegiate Dictionary
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