Dictionary.net

in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers

in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers

of Protozoon

A subkingdom consisting of unicellular organisms that are the simplest in the animal kingdom. Most are free living. They range in size from submicroscopic to macroscopic. Protozoa are divided into seven phyla: SARCOMASTIGOPHORA; Labyrinthomorpha, APICOMPLEXA; MICROSPORA; Ascetospora, Myxozoa, and CILIOPHORA.

pl. of protozoan. A class of unicellular animal organisms.

The lowest subdivision or phylum of the animal kingdom, consisting always of a single cell. It includes many species pathogenic to man. [Gr.]