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Definition of Facultative

Facultative: 1. In general, not obligatory but rather capable of adapting to different conditions.
2. In bacteriology, bacteria that can grow under either aerobic or anaerobic circumstances (with or without oxygen).

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=31986
Last Editorial Review: 9/20/2012

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