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Incisors

chisel shaped teeth at the front of the mouth in mammals. All primates normally have 8 incisors (2 in each quadrant of the mouth). See dental formula.

Ischial callosities

hairless, callused areas on either side of the rump of monkeys in the Old World monkey subfamily Cercopithecinae (macaques, baboons, etc.) and the small apes of Asia.