oxygen mask

noun
a masklike device placed or worn over the nose and mouth when inhaling supplementary oxygen from an attached tank.

Origin:
1915–20

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Collins
World English Dictionary
oxygen mask
 
n
a device, worn over the nose and mouth, to which oxygen is supplied from a cylinder or other source: used to aid breathing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

oxygen mask n.
A masklike device that is placed over the mouth and nose and through which oxygen is supplied from an attached storage tank.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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