Protozoa

[ proh-tuh-zoh-uh ]
/ ˌproʊ təˈzoʊ ə /

noun

a major grouping or superphylum of the kingdom Protista, comprising the protozoans.

Origin of Protozoa

From New Latin, dating back to 1825–35; see origin at proto-, -zoa

protozoan

[ proh-tuh-zoh-uh n ]
/ ˌproʊ təˈzoʊ ən /
Biology

noun, plural pro·to·zo·ans, (especially collectively) pro·to·zo·a [proh-tuh-zoh-uh] /ˌproʊ təˈzoʊ ə/.

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

of, relating to, or characteristic of a protozoan.

Origin of protozoan

First recorded in 1860–65; Protozo(a) + -an

protozoon

[ proh-tuh-zoh-on, -uh n ]
/ ˌproʊ təˈzoʊ ɒn, -ən /

noun, plural pro·to·zo·a [proh-tuh-zoh-uh] /ˌproʊ təˈzoʊ ə/.

Origin of protozoon

singular of Protozoa

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for protozoa


British Dictionary definitions for protozoa

protozoan

/ (ˌprəʊtəˈzəʊən) /

noun plural -zoa (-ˈzəʊə) or -zoans

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

adjective Also: protozoic

of or relating to protozoans

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

Word Origin and History for protozoa

Protozoa

n.

1828, from Modern Latin Protozoa, coined 1818 by German zoologist Georg August Goldfuss (1782-1848) from Greek protos "first" (see proto-) + zoia, plural of zoion "animal" (see zoo). Originally including sponges and corals; current sense is from 1845. Related: Protozoon (aingular); Protozoan.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for protozoa

protozoa

[ prō′tə-zōə ]

n.

Plural ofprotozoan

protozoan

[ prō′tə-zōən ]

n. pl. pro•to•zo•a (-zōə)

Any of a group of single-celled, usually microscopic, eukaryotic organisms, such as amoebas, ciliates, flagellates, and sporozoans.
Related formspro′to•zoan null null adj.


The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for protozoa

protozoan

[ prō′tə-zōən ]

Plural protozoans 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Culture definitions for protozoa

protozoa

[ (proh-tuh-zoh-uh) ]

Single-celled animals, such as amoebas, that are the most primitive form of animal life. In modern biology, they are classified in the kingdom of Protoctista rather than in the animal kingdom. (See Linnean classification.)

Note

Some protozoa are parasites and may be pathogenic, causing diseases such as malaria and dysentery.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.