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Protozoa [r]: 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, Apicomplexia, Microspora, Ascetospora, Myxozoa, and Ciliophora.

This definition is at least in part based on: Anonymous (2023), Protozoa (English). Medical Subject Headings. U.S. National Library of Medicine.