1. adj. []
The condition of an environment in which free oxygen is lacking or absent.
Synonyms: anoxic
2. adj. []
A description of organisms that can survive in the absence of oxygen, particularly bacteria.
3. adj. []
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: bactericide, biodegradation, sour gas, sulfate-reducing bacteria