protozoan

[proh-tuh-zoh-uhn] Biology.
noun, plural protozoans (especially collectively) protozoa [proh-tuh-zoh-uh] .
1.
any of a diverse group of eukaryotes, of the kingdom Protista, that are primarily unicellular, existing singly or aggregating into colonies, are usually nonphotosynthetic, and are often classified further into phyla according to their capacity for and means of motility, as by pseudopods, flagella, or cilia.
adjective
2.
of, pertaining to, or characteristic of a protozoan.

Origin:
1860–65; Protozo(a) + -an

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World English Dictionary
protozoan (ˌprəʊtəˈzəʊən)
 
n , pl -zoa, -zoans, -zoa
1.  Also called: protozoon any of various minute unicellular organisms formerly regarded as invertebrates of the phylum Protozoa but now usually classified in certain phyla of protoctists. Protozoans include flagellates, ciliates, sporozoans, amoebas, and foraminifers
 
adj
2.  of or relating to protozoans
 
[C19: via New Latin from Greek proto- + zoion animal]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

protozoan pro·to·zo·an (prō'tə-zō'ən) or pro·to·zo·on (-ŏn')
n. pl. pro·to·zo·a (-zō'ə) or pro·to·zo·ans or pro·to·zo·a or pro·to·zo·ons
Any of a group of single-celled, usually microscopic, eukaryotic organisms, such as amoebas, ciliates, flagellates, and sporozoans.


pro'to·zo'an or pro'to·zo'al or pro'to·zo'ic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
protozoan   (prō'tə-zō'ən)  Pronunciation Key 
Plural protozoans or protozoa
Any of a large group of one-celled organisms (called protists) that live in water or as parasites. Many protozoans move about by means of appendages known as cilia or flagella. Protozoans include the amoebas, flagellates, foraminiferans, and ciliates. Their traditional classification as the subkingdom Protozoa is still used for convenience, but it is now known that protozoans represent several evolutionarily distinct groups. See more at protist.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The parasite, a single-cell organism known as a protozoan, goes through
  different phases in both its mosquito and human hosts.
From barnacles that hijack crabs to a protozoan that makes rodents cozy up to
  cats, parasites do a lot more than make you puke.
And there are major hurdles to be leaped if printless text publishing is going
  to move from protozoan to pachyderm.
The protozoan caused vomiting and watery diarrhea as well.
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