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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
aer•o•phore(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.