protist

[proh-tist]
noun
any of various one-celled organisms, classified in the kingdom Protista, that are either free-living or aggregated into simple colonies and that have diverse reproductive and nutritional modes, including the protozoans, eukaryotic algae, and slime molds: some classification schemes also include the fungi and the more primitive bacteria and blue-green algae or may distribute the organisms between the kingdoms Plantae and Animalia according to dominant characteristics.

Origin:
1885–90; < Neo-Latin Protista (neuter plural) name of the kingdom < Greek prṓtistos (masculine singular) the very first, superlative of prôtos first; see proto-

protistan [proh-tis-tuhn] , adjective, noun
protistic, adjective
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World English Dictionary
protist (ˈprəʊtɪst)
 
n
See also protoctist (in some classification systems) any organism belonging to the kingdom Protista, originally including bacteria, protozoans, algae, and fungi, regarded as distinct from plants and animals. It was later restricted to protozoans, unicellular algae, and simple fungi
 
[C19: from New Latin Protista most primitive organisms, from Greek prōtistos the very first, from prōtos first]

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American Heritage
Medical Dictionary

protist pro·tist (prō'tĭst)
n.
A unicellular, eukaroytic organism belonging to the former taxonomic kingdom Protista.

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
protist   (prō'tĭst)  Pronunciation Key 
Any of a large variety of usually one-celled organisms belonging to the kingdom Protista (or Protoctista). Protists are eukaryotes and live in water or in watery tissues of organisms. Some protists resemble plants in that they produce their own food by photosynthesis, while others resemble animals in consuming organic matter for food. Protist cells are often structurally much more elaborate than the cells of multicellular plants and animals. Protists include the protozoans, most algae, diatoms, oomycetes, and the slime molds. Also called protoctist. See Table at taxonomy.
The American Heritage® Science Dictionary
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Example sentences
Protists are a kingdom of celled organisms distinct from animals, plants, and
  fungi.
Other types of protists include algae and slime molds.
And even protists share many, many genes with multicellular organisms as large
  and complex as ourselves.
Thus, for the moment, evolutionary cell biology is ultimately the cell biology
  of protists in light of evolution.
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