protozoan, protozoon - any of diverse minute acellular or unicellular organisms usually nonphotosynthetic

class Flagellata, class Mastigophora, Flagellata, Mastigophora - protozoa having flagella

dinoflagellate - chiefly marine protozoa having two flagella; a chief constituent of plankton

genus Leishmania, Leishmania - flagellate protozoan that causes leishmaniasis

zooflagellate, zoomastigote - flagellate protozoan lacking photosynthesis and other plant-like characteristics

hypermastigote - flagellate symbiotic in the intestines of e.g. termites

polymastigote - flagellates with several flagella

costia, Costia necatrix - a flagellate that is the cause of the frequently fatal fish disease costiasis

giardia - a suspected cause of diarrhea in humans

trichomonad - cause of trichomoniasis in women and cattle and birds

flog, lash, trounce, welt, whip, lather, slash, strap - beat severely with a whip or rod; "The teacher often flogged the students"; "The children were severely trounced"