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