gnathic index

noun

gnathic index

noun

Archaic In a skull, the ratio of the distance from the middle of the nasofrontal suture to the basion (taken equal to 100), to the distance from the basion to the middle of the front edge of the upper jaw.

Skulls with the gnathic index below 98 are orthognathous, from 98 to 103 mesognathous, and above 103 are prognathous.

Synonyms: alveolar index

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.