having or consisting of a single cell.

1855–60; uni- + cellular

unicellularity, noun
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World English Dictionary
unicellular (ˌjuːnɪˈsɛljʊlə)
(of organisms, such as protozoans and certain algae) consisting of a single cell

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American Heritage
Medical Dictionary

unicellular u·ni·cel·lu·lar (yōō'nĭ-sěl'yə-lər)
Having or consisting of a single cell, as the protozoans; one-celled.

u'ni·cel'lu·lar'i·ty (-lār'ĭ-tē) n.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
unicellular   (y'nĭ-sěl'yə-lər)  Pronunciation Key 
Having or consisting of a single cell. Compare multicellular.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They dumped unicellular yeast into a tube of liquid food and waited a few minutes for the cells to settle.
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