[an-ok-see-uh, uh-nok-]
an abnormally low amount of oxygen in the body tissues; hypoxia.
the mental and physical disturbances that occur as a result of hypoxia.

1930–35; an-1 + ox(ygen) + -ia

anoxic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anoxia (ænˈɒksɪə)
1.  lack or absence of oxygen
2.  Compare hypoxia a deficiency of oxygen in tissues and organs
[C20: from an- + ox(ygen) + -ia]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1920, Mod.L., from Gk. an-, privative prefix, "not, without" + first two letters of oxygen. Anoxia is attested from 1931.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

anoxia an·ox·i·a (ān-ŏk'sē-ə, ə-nŏk'-)
The absence or reduced supply of oxygen in inspired gases, arterial blood, or tissues.

an·ox'ic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Sea water that is both deep and still, such as at the bottoms of some fjords, tends to be hypoxic or anoxic.
Pollution sometimes turns waters anoxic today in regions that lack good circulation.
But now scientists say they have found the first multicellular organisms inhabiting an anoxic environment.
The anoxic zone should be designed for complete denitrification to prevent the recycling of nitrates to the anaerobic zone.
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