| obligate aerobe | An organism which cannot live or grow in the absence of oxygen. (05 Mar 2000) |
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| aerobe | <microbiology> An organism that can or must live in an oxygen-containing environment andwhich uses oxygen as the terminal electron acceptor in respiration. (06 May 1997) |
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| obligate | Without an alternative system or pathway. Origin: L. Ob-ligo, pp. -atus, to bind to (05 Mar 2000) |
| obligate parasite | A parasite that cannot lead an independent nonparasitic existence, in contrast to facultative parasite. (05 Mar 2000) |
| facultative aerobe | <microbiology> An organism which is normally anaerobic but can also grow in the presence or oxygen. (15 Nov 1997) |