gnathion

The most inferior point of the mandible in the midline. In cephalometrics, it is the midpoint between the most anterior and inferior point on the bony chin, measured at the intersection of the mandibular baseline and the nasion-pogonion line. [G. gnathos, jaw]

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gna·thi·on 'nā-thē-.än, 'na- n the midpoint of the lower border of the human mandible compare LINGUALE

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n.

the lowest point of the mid-line of the lower jaw (mandible).

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gnath·i·on (nathґe-on) a craniometric landmark indicating the lowest median point on the inferior border of the mandible; it is a derived point midway between the most anterior (pogonion) and inferior (menton), established by bisecting the angle between the nasion–pogonion and mandibular planes.