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1. adj. [Geology]

The condition of an environment in which free oxygen is lacking or absent.

Synonyms: anoxic

2. adj. [Geology]

A description of organisms that can survive in the absence of oxygen, particularly bacteria.

3. adj. [Drilling Fluids]

Pertaining to systems, reactions, or life processes of species, such as bacteria, in which atmospheric oxygen is not present or not required for survival.

Antonyms: aerobic

See: bactericidebiodegradationsour gassulfate-reducing bacteria