Definition of Unicellular

an organism (such as protozoa, some algae or spores) that are made of only one cell

Examples of Unicellular in a sentence

A simple creature that has only one cell with no nucleus is called unicellular.  🔊

Bacteria are unicellular and tiny, making their singular-celled bodies invisible to the naked eye.  🔊

A protozoon is an animal-like being that is unicellular, meaning it doesn’t have more than one cell in its body.  🔊

Unicellular organisms have been on Earth for over three billion years and many have evolved into creatures with more than one cell.  🔊

Unicellular protozoa are tiny, one-celled creatures that live in moist areas.  🔊

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