Composed of but one cell, as in the protozoons; for such u. organisms capable of undertaking life processes independently of other cells, the term acellular is also used.
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uni·cel·lu·lar .yü-ni-'sel-yə-lər adj having or consisting of a single cell <\unicellular microorganisms>
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adj.
describing organisms or tissues that consist of a single cell. Unicellular organisms include the protozoans, most bacteria, and some fungi.
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uni·cel·lu·lar (u″nĭ-selґu-lər) [uni- + cellular] made up of but a single cell, as the bacteria.Medical dictionary. 2011.