n 1  :  MONKEY : esp  :  one of the larger tailless or short-tailed Old World forms  2  :  any of the large tailless semierect primates (as the chimpanzee, gorilla, orangutan, or gibbon) that comprise two primate families (Pongidae and Hylobatidae) - called also anthropoid , anthropoid ape  .
 
 
 
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