Etymology
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simian (adj.)

"characteristic of monkeys or apes," c. 1600, from Latin simia "ape," from simus "snub-nosed," from Greek simos "snub-nosed" (like the Scythians), also a masculine proper name, of unknown origin. Biological meaning "pertaining to monkeys" is from 1863. The noun meaning "an ape or monkey" first is attested in 1880.

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Definitions of simian
1
simian (n.)
an ape or monkey;
2
simian (adj.)
relating to or resembling an ape;
simian features
From wordnet.princeton.edu