Etymology
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biologist (n.)

"a student of the science of life," 1813, from biology + -ist. Earliest use is in reference to human life (with the Greek sense of bios); in its modern scientific sense by 1874. Biologian is attested from 1865.

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Definitions of biologist

biologist (n.)
(biology) a scientist who studies living organisms;
Synonyms: life scientist
From wordnet.princeton.edu