Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A usually portable, lightweight, vestlike breathing apparatus that recycles oxygen from exhaled air, absorbs exhaled carbon dioxide, and has a small container providing fresh air, used by scuba divers and astronauts, as well as rescue workers in environments where the air is thought to be toxic.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A breathing apparatus that recycles expelled air, removing carbon dioxide and allowing extended use of a supply.

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