Source : Webster's Revised Unabridged Dictionary (1913)

Simian \Sim"i*an\, a. [L. simia an ape.] (Zo["o]l.)
   Of or pertaining to the family {Simiad[ae]}, which, in its
   widest sense, includes all the Old World apes and monkeys;
   also, apelike. -- n. Any Old World monkey or ape.

Source : WordNet®

simian
     adj : relating to or resembling an ape; "simian features"
     n : an ape or monkey