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Medical Definition of Epimastigote
1. Term replacing "crithidial stage," to avoid confusion with the insect-parasitizing flagellates of the genus Crithidia. In the epimastigote stage the flagellum arises from the kinetoplast alongside the nucleus and emerges from the anterior end of the organism; an undulating membrane is present. Origin: epi-+ G. Mastix, whip (05 Mar 2000)