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Definition of chink. 1 : a small cleft, slit, or fissure a chink in the fence. 2 : a weak spot that may leave one vulnerable his lawyers found a chink in the law. 3 : a narrow beam of light shining through a chink.
The chin or the mental region is the area of the face below the lower lip and including the mandibular prominence. It is formed by the lower front of the mandible. In humans there is a wide variety of chin structures, e.g. cleft chin. In human evolution, the chin is a cladistic apomorphy, partially defining anatomically modern humans as distinct from archaic forms.