gnathic index

noun

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.”

Similar
alveolar index
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Meanings

noun
  1. archaicIn 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

Synonyms & antonyms

nounIn 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.

Similar
alveolar index
Cite this entry
APA

gnathic index. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/gnathic%20index

MLA

“gnathic index.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/gnathic%20index. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “gnathic index,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/gnathic%20index.

Source: gnathic index on Wiktionary, CC BY-SA 4.0.