The bone of the lower jaw; the mandible or any part of the lower facial structure formed by bone.
Compound of 'chin' and 'bone,' a straightforward descriptive term that has been used in anatomical English since at least the 16th century.
Your chinbone is part of your mandible, and its shape is so genetically individual that forensic scientists can identify people from their jawbone fragments—it's like a skeletal fingerprint.
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