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Wikipedia definition
1. ChinIn the human anatomy, the chin is the lowermost part of the face. It is formed by the lower front of the mandible. People show a wide variety of chin structures. See Cleft chin. The chin developed as a point of muscular attachment facilitating minute movements of the lips associated with speech. In human evolution, the chin is a cladistic apomorphy, partially defining anatomically modern Humans as distinct from archaic forms. See also Otofacial syndrome Genioplasty
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