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A device to supply air to a nonbreathing infant or to a person in an environment where there is no oxygen, such as a closed mine.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


a device which supplies oxygen in order to aid breathing
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈɛər əˌfɔr, -ˌfoʊr)

a portable breathing apparatus filled with compressed air.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
The taxa with petiolulate pinnae, lamina and axis with abundant indument, and bulbils or aerophores in the raquis, were separated from the B.
Rachises are scaly, papillate, with occasional aerophores in the base of pinnae.
Rachises scaly, papillate, aerophores occasional in the base of pinnae.