Dictionary

oxygen mask

noun

: a mask worn over your nose and mouth so that you can breathe oxygen from a storage tank

Full Definition of OXYGEN MASK

:  a device worn over the nose and mouth through which oxygen is supplied from a storage tank

First Known Use of OXYGEN MASK

1920

oxygen mask

noun    (Medical Dictionary)

Medical Definition of OXYGEN MASK

:  a device worn over the nose and mouth through which oxygen is supplied from a storage tank

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