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[prog-nuh-thuh s, prog-ney-] /ˈprɒg nə θəs, prɒgˈneɪ-/
adjective, Craniometry.
having protrusive jaws; having a gnathic index over 103.
Also, prognathic
[prog-nath-ik] /prɒgˈnæθ ɪk/ (Show IPA)
Origin of prognathous
First recorded in 1830-40; pro-2 + -gnathous
Related forms
[prog-nuh-thiz-uh m] /ˈprɒg nəˌθɪz əm/ (Show IPA),
prognathy, noun
hyperprognathous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for prognathism
Historical Examples
  • There is no tendency to prognathism, as in some of the Celts.

  • The lips are thick and bowed, but there is little or no prognathism.

  • It presents no indication of the prognathism which modifies the facial angle.

  • Some prognathism is common among Fijians, both total and mid-facial, but the condition is not universal nor pronounced.

  • prognathism, the projection of the lower portion of the face beyond the forehead, is found in 45.7% of criminals.

    Criminal Man Gina Lombroso-Ferrero
  • prognathism "presents too many individual varieties to be taken as a distinctive character of race."

    The Negro W.E.B. Du Bois
  • It was long admitted that prognathism, or projection of the jaws, was peculiar to the Negro race.

    The Human Race Louis Figuier
  • prognathism, or projection of the jaws (index number of facial angle about 70, as compared with the Caucasian 82).

    The Color Line William Benjamin Smith
  • Our attention should next be directed to the facial profile, in order to observe the form and degree of prognathism.

    Pedagogical Anthropology Maria Montessori
  • The cheekbones and zygomatic arch are prominent, and a degree of prognathism is prevalent.

British Dictionary definitions for prognathism


having a projecting lower jaw
Derived Forms
prognathism (ˈprɒɡnəˌθɪzəm) noun
Word Origin
C19: from pro-² + Greek gnathos jaw
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for prognathism



1836, from pro- + Greek gnathos "jaw" (see gnathic) + -ous. Related: Prognathic.

Online Etymology Dictionary, © 2010 Douglas Harper
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prognathism in Medicine

prognathous prog·na·thous (prŏg'nə-thəs, prŏg-nā'-) or prog·nath·ic (prŏg-nāth'ĭk, -nā'thĭk)
Having jaws that project forward to a marked degree.

prog'na·thism (-nə-thĭz'əm) n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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