from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A masklike device placed over the mouth and nose and through which oxygen is supplied from an attached storage tank.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A plastic or rubber mask through which oxygen may be breathed from a storage tank.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a breathing device that is placed over the mouth and nose; supplies oxygen from an attached storage tank
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