'Simian' definitions:

Definition of 'simian'

(from WordNet)
adjective
Relating to or resembling an ape; "simian features"
noun
An ape or monkey

Definition of 'Simian'

From: GCIDE
  • Simian \Sim"i*an\, a. [L. simia an ape.] (Zool.) Of or pertaining to the family Simiadae, which, in its widest sense, includes all the Old World apes and monkeys; also, apelike. -- n. Any Old World monkey or ape. [1913 Webster]