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1. of or pertaining to protozoa.
2. an organism belonging to the Protozoa.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


1. A member of the phylum Protozoa. Synonym(s): protozoon
2. Relating to protozoa. Synonym(s): protozoal
Farlex Partner Medical Dictionary © Farlex 2012


(prō′tə-zō′ən) also


n. pl. proto·zoans or proto·zoa (-zō′ə) also proto·zoons
Any of numerous chiefly single-celled eukaryotic organisms, most of which move about freely and ingest food, including the amoebas, ciliates, flagellates, and apicomplexans. Protozoans along with certain algae, oomycetes, and some other groups make up the protists.

pro′to·zo′an, pro′to·zo′al, pro′to·zo′ic adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


1. A member of the phylum Protozoa.
Synonym(s): protozoon.
2. Relating to protozoa.
Synonym(s): protozoal.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


any member of the phylum Protozoa (sometimes regarded as a subkingdom of the animal kingdom), including unicellular or acellular organisms. The members of the group feed as HOLOPHYTES, SAPROPHYTES or in a HOLOZOIC manner, move by means of FLAGELLA, CILIA or PSEUDOPODIA, and reproduce by FISSION or CONJUGATION.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Protozoan (plural, protozoa)

A single-celled, usually microscopic organism, such as B. coli, that is eukaryotic and, therefore, different from bacteria (prokaryotic).
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.