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From The Collaborative International Dictionary of English v.0.48:
Chin \Chin\ (ch[i^]n), n. [AS. cin, akin to OS. kin, G kinn, Icel. kinn, cheek, Dan. & Sw. kind, L. gena, Gr. ?; cf. Skr. hanu. [root]232.] 1. The lower extremity of the face below the mouth; the point of the under jaw. [1913 Webster] 2. (Zool.) The exterior or under surface embraced between the branches of the lower jaw bone, in birds. [1913 Webster]