anaerobic

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anaerobic
1. Of an environment: one in which oxygen is absent.

2. Of an organism: one able to exist only in the absence of oxygen, i.e. an anaerobe. Organisms may be facultative anaerobes (e.g. yeasts) or obligatory anaerobes (e.g. sulphur bacteria).

3. Of a process: one that can occur only in the absence of oxygen.

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