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 (prō′tə-zō′ən) also pro·to·zo·on (-ŏn′)
n. pl. pro·to·zo·ans or pro·to·zo·a (-zō′ə) also pro·to·zo·ons
Any of numerous chiefly single-celled eukaryotic organisms, most of which move about freely and ingest food, including the amoebas, ciliates, flagellates, and apicomplexans. Protozoans along with certain algae, oomycetes, and some other groups make up the protists.

[From New Latin Prōtozōa, former subkingdom name : proto- + -zōa, pl. of -zōon, -zoon.]

pro′to·zo′an, pro′to·zo′al, pro′to·zo′ic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.protozoic - of or relating to the Protozoa
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Bleistein is a disturbance in the poem and part of this is due to the protean nature within him: another Sweeney-like character, he not only looks like an ape ("A saggy bending of the knees / And elbows, with the palms turned out"), but he also has an eye/I associated with the lowest and simplest form of living matter ("A lusterless protrusive eye / Stares from the protozoic slime") (CPP 40).
Fabulated Marshmellows, Protozoic Spliff, and Netherworldy Mugwumps are all examples of a two word search query that returns exactly one hit in Google.
It can be adapted to the boundaryless and protean career, that my local butcher described sarcastically as the protozoic and often pay-less career, and which has been described in these words: The term Protean is derived from Greek mythology.