Dictionary.com
definitions
  • synonyms

protozoan

[proh-tuh-zoh-uh n]Biology
See more synonyms for protozoan on Thesaurus.com
noun, plural pro·to·zo·ans, (especially collectively) pro·to·zo·a [proh-tuh-zoh-uh] /ˌproʊ təˈzoʊ ə/.
  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.
Show More
adjective
  1. of, relating to, or characteristic of a protozoan.
Show More

Origin of protozoan

First recorded in 1860–65; Protozo(a) + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for protozoan

cell, flagellate, organism, plasmodium, ameba, euglena, paramecium, ciliate, amoeba, sporozoan, stentor

Examples from the Web for protozoan

Historical Examples of protozoan

  • Inside this snail's gut there is a protozoan that lives off the snail's ingested food.

    Planet of the Damned

    Harry Harrison

  • A species of Vorticella was probably the first Protozoan that was ever observed.

    Insects and Diseases

    Rennie W. Doane

  • Description of the protozoan parasites recognized in this study.

  • Protozoan parasites in relation to the host and to host ecology.

  • The Protozoan swims by the vibration of these cilia in the water.

British Dictionary definitions for protozoan

protozoan

noun plural -zoa (-ˈzəʊə) or -zoans
  1. Also called: protozoon (ˌprəʊtəˈzəʊɒn) plural -zoa 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
Show More
adjective Also: protozoic
  1. of or relating to protozoans
Show More

Word Origin for protozoan

C19: via New Latin from Greek proto- + zoion animal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
protozoan in Medicine

protozoan

(prō′tə-zō′ən)
n. pl. pro•to•zo•a (-zō′ə)
  1. Any of a group of single-celled, usually microscopic, eukaryotic organisms, such as amoebas, ciliates, flagellates, and sporozoans.
Show More
Related formspro′to•zo′an null null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
protozoan in Science

protozoan

[prō′tə-zō′ən]
Plural protozoans protozoa
  1. 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.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.