Main Entry: Pri·ma·tes
Pronunciation: prI-'mA-"tEz
Function: noun plural
: an order of eutherian mammals including humans, apes, monkeys,lemurs, and living and extinct related forms that are all thought to be derived from generalized arboreal ancestors and that are in general characterized by increasing perfection of binocular vision,specialization of the appendages for grasping, and enlargement and differentiation of the brain

primate   (prī'māt')  Pronunciation Key  Any of various mammals of the order Primates, having a highly developed brain, eyes facing forward, a shortened nose and muzzle, and opposable thumbs. Primates usually live in groups with complex social systems, and their high intelligence allows them to adapt their behavior successfully to different environments. Lemurs, monkeys, apes, and humans are primates.