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Definition of Choanoflagellate
1. Noun. (biology) Any of a group of flagellate protozoa, of the class ''Choanoflagellatea'', thought to be the closest unicellular ancestors of animals ¹
¹ Source: wiktionary.com
Medical Definition of Choanoflagellate
1. A term, in the series used to describe developmental stages of the parasitic flagellates, denoting the "barleycorn" form of the flagellate in the genus Crithidia characterised by a collarlike extension surrounding the anterior and through which the single flagellum emerges. See: amastigote, epimastigote, promastigote, trypomastigote. Synonym: choanoflagellate, collared flagellate. Origin: G. Choane, a funnel, + mastix, whip (05 Mar 2000)