noun pro·to·zo·an \-ˈzō-ən\

: a tiny organism whose body is a single cell

Full Definition of PROTOZOAN

:  any of a phylum or subkingdom (Protozoa) of chiefly motile and heterotrophic unicellular protists (as amoebas, trypanosomes, sporozoans, and paramecia) that are represented in almost every kind of habitat and include some pathogenic parasites of humans and domestic animals
protozoan adjective


New Latin Protozoa, from prot- + -zoa
First Known Use: circa 1864

Rhymes with PROTOZOAN


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