simian

from WordNet (r) 3.0 (2006)

simian
    adj 1: relating to or resembling an ape; "simian features"
    n 1: an ape or monkey

from The Collaborative International Dictionary of English v.0.48

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]