| ectocommensal organism | An organism that benefits from living on the outer surface of another organism without harming the other organism. A type of commensalism. (09 Oct 1997) |
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| transgenic organism | <molecular biology> Organisms that have integrated foreign DNA into their germ line as a result of the experimental introduction of DNA. Recombinant DNA techniques are commonly used to produce a transgenic organism. (13 Nov 1997) |
| enteric organism | A microorganism that lives in the intestines. (09 Oct 1997) |
| fastidious organism | A bacterial organism having complex nutritional requirements. (05 Mar 2000) |