1. (noun)flagellate, flagellate protozoan, flagellated protozoan, mastigophoran, mastigophore a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals
2. (adj)flagellate, flagellated, whiplike, lash-like having or resembling a lash or whip (as does a flagellum)
3. (verb)flagellate, scourge whip "The religious fanatics flagellated themselves"