of or pertaining to an ape or monkey.
characteristic of apes or monkeys: long, simian fingers.
an ape or monkey.

1600–10; < Latin sīmi(a) an ape (probably derivative of sīmus flat-nosed < Greek sīmós) + -an

simianity [sim-ee-an-i-tee] , noun
subsimian, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
simian (ˈsɪmɪən)
1.  Also (rare): simious of, relating to, or resembling a monkey or ape
2.  a monkey or ape
[C17: from Latin sīmia an ape, probably from sīmus flat-nosed, from Greek sīmos]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"pertaining to monkeys or apes," 1607, from L. simia "ape," from simus "snub-nosed," from Gk. simos "snub-nosed, bent upward," of unknown origin. The noun meaning "an ape or monkey" first is attested in 1880.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
simian   (sĭm'ē-ən)  Pronunciation Key 
Adjective   Resembling or characteristic of apes or monkeys.

Noun   An ape or monkey. Ther term simian is no longer used in scientific contexts. Compare prosimian.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The signs include slanted eyes, simian skin creases, flabby muscle tone.
Those trying to control the planet should perhaps begin by controlling their
  simian selves.
They decided to look first for simian foamy virus, a primate retrovirus.
Those monkeys came in the middle of a long line of simian astronauts.
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