[an-uh-roh-bik, an-ai-]
(of an organism or tissue) living in the absence of air or free oxygen.
pertaining to or caused by the absence of oxygen.

1880–85; anaerobe + -ic

anaerobically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anaerobic (ˌænɛəˈrəʊbɪk)
1.  (of an organism or process) requiring the absence of or not dependent on the presence of oxygen
2.  of or relating to anaerobes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"capable of living without oxygen," 1879 (as anaerobian, modern form first attested 1884), from Fr. anaérobie, coined 1863 by Louis Pasteur, from Gk. an- "without" + aer "air" + bios "life" (see bio-).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

anaerobic an·aer·o·bic (ān'ə-rō'bĭk, -â-rō'bĭk)

  1. Relating to or being an anaerobe.

  2. Living without 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
anaerobic   (ān'ə-rō'bĭk)  Pronunciation Key 
Occurring in the absence of oxygen or not requiring oxygen to live. Anaerobic bacteria produce energy from food molecules without the presence of oxygen. Compare aerobic.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
anaerobic [(an-uh-roh-bik, an-air-oh-bik)]

A descriptive term for a process, such as fermentation, that can proceed only in the absence of oxygen, or a living thing that can survive only in the absence of oxygen. (Compare aerobic.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
In periodontal disease, the bacterial balance shifts over to gram negative
  anaerobic bacteria.
Because this is where anaerobic bacteria, which produce sulfur, in the course
  of their processing get involved.
It is only when the piles become starved of oxygen that noxious anaerobic
  activity begins.
The real answer may be to put in microbes that are only anaerobic.
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