• synonyms


[prog-nuh-thuh s, prog-ney-]
adjective Craniometry.
  1. having protrusive jaws; having a gnathic index over 103.
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Also prog·nath·ic [prog-nath-ik] /prɒgˈnæθ ɪk/.

Origin of prognathous

First recorded in 1830–40; pro-2 + -gnathous
Related formsprog·na·thism [prog-nuh-thiz-uh m] /ˈprɒg nəˌθɪz əm/, prog·na·thy, nounhy·per·prog·na·thous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for prognathism

Historical Examples

  • There is no tendency to prognathism, as in some of the Celts.

    Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3


  • 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

British Dictionary definitions for prognathism


prognathic (prɒɡˈnæθɪk)

  1. having a projecting lower jaw
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Derived Formsprognathism (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

Word Origin and History for prognathism



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

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Online Etymology Dictionary, © 2010 Douglas Harper

prognathism in Medicine


(prŏgnə-thəs, prŏg-nā-)
  1. Having jaws that project forward to a marked degree.
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Related formsprogna•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.