Meaning & use
unicellular
Consisting of only a single cell, as in the simplest forms of life.
See it in a sentence
Bacteria are unicellular organisms that are visible only under a microscope.
The biology class studied a unicellular amoeba moving across the slide.
A note on using this word
Unicellular contrasts directly with multicellular, the term for organisms made of many cells.
Words with a similar meaning
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Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
multicellular
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