| obligate | Without an alternative system or pathway. Origin: L. Ob-ligo, pp. -atus, to bind to (05 Mar 2000) |
|---|---|
| obligate aerobe | An organism which cannot live or grow in the absence of oxygen. (05 Mar 2000) |
| obligate parasite | A parasite that cannot lead an independent nonparasitic existence, in contrast to facultative parasite. (05 Mar 2000) |