Unicellular
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Having, or consisting of, but a single cell; as, a unicellularorganism.
Unicellular meaning & definition 1 of Unicellular.
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A unicellular organism is made of only one cell:
Unicellular meaning & definition 2 of Unicellular.
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(of protozoans, certain algae, spores, etc.) consisting of a single cell.
Unicellular meaning & definition 3 of Unicellular.