gonion

The lowest posterior and most outward point of the angle of the mandible. In cephalometrics, it is measured by bisecting the angle formed by the tangents to the lower and the posterior borders of the mandible; when the angles of both sides of the mandible appear on the lateral radiograph, a point midway between the right and left side is used. [G. gonia, an angle]

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go·ni·on 'gō-nē-.än n, pl go·nia -nē-ə the point on each lower human jaw closest to the vertex of the gonial angle

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n.

the point of the angle of the lower jawbone (mandible).

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go·ni·on (goґne-on) pl. goґnia [Gr. gōnia angle] [TA] a craniometric landmark located at the most inferior, posterior, and lateral point on the external angle of the mandible, being the apex of the maximum curvature of the mandible, where the ascending ramus becomes confluent with the corpus. gonial adj