Definition of simian adjective from the Oxford Advanced Learner's Dictionary

 

simian

 adjective
adjective
BrE BrE//ˈsɪmiən//
 
; NAmE NAmE//ˈsɪmiən//
 
(specialist)
 
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like a monkey or an ape; connected with monkeys or apes simian arms a simian virus Word Origin early 17th cent.: from Latin simia ‘ape’, perhaps via Latin from Greek simos ‘flat-nosed’.
See the Oxford Advanced American Dictionary entry: simian