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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