Protoctista

[ prō′tək-tĭstə ]

n.

A taxonomic kingdom consisting of unicellular protists and their descendant multicellular organisms, considered as a separate taxonomic kingdom in most modern classification systems.

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

Cultural definitions for Protoctista

Protoctista
[ (pruh-tohk-tis-ta) ]

The kingdom of organisms, mostly single celled, whose cells contain a nucleus. The amoeba is a member of this kingdom.

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.