Pronunciation: go'ne-on, go'ne-a
Definition: 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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Examples: glitazone, GI cocktail, etc.