[an-uh-rohb, an-air-ohb]
an organism, especially a bacterium, that does not require air or free oxygen to live (opposed to aerobe ).

1875–80; an-1 + aerobe Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anaerobe or anaerobium (æˈnɛərəʊb, ˈænərəʊb, ˌænɛəˈrəʊbɪəm)
n , pl -obes, -obia
Compare aerobe an organism that does not require oxygen for respiration
anaerobium or anaerobium (æˈnɛərəʊb, ˈænərəʊb, ˌænɛəˈrəʊbɪəm, -ˈəʊbɪə)

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

anaerobe an·aer·obe (ān'ə-rōb', ān-âr'ōb')
An organism that can live in the absence of atmospheric oxygen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
anaerobe   (ān'ə-rōb')  Pronunciation Key 
An organism, such as a bacterium, that can or must live in the absence of oxygen. Compare aerobe.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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