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Definition of Ectosymbiont
1. Noun. (biology) A partner in a symbiotic relationship that remains on the surface of its host or occupies a body cavity ¹
¹ Source: wiktionary.com
Medical Definition of Ectosymbiont
1. An organism which is participating in ectosymbiosis (a form of symbiosis in which the organisms involved are physically separated). (09 Oct 1997)