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Definition of oxygen mask noun from the Oxford Advanced Learner's Dictionary

oxygen mask

noun

/ˈɒksɪdʒən mɑːsk/

/ˈɑːksɪdʒən mæsk/

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a device placed over the nose and mouth through which a person can breathe oxygen, for example in an aircraft or a hospitalTopics Transport by airc1, Healthcarec1

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See oxygen mask in the Oxford Advanced American Dictionary

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noun

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