(1) A condition in which oxygen is completely absent or depleted.

(2) Severe hypoxia; lack of oxygen supply, e.g. to a body organ or tissue.


Anoxia happens when a body tissue is completely deprived of oxygen. It is also observed in the environment, particularly when oxygen is depleted in a basin. This leads to denitrification wherein bacteria use nitrate of sea water as the second-best electron acceptor when oxygen is absent in water.

Word origin: an- (without) + oxy(gen) -ia.
Related forms: anoxic (adjective)

Compare: hyperoxia
See also: hypoxia

Related terms:

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