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lantern jaw

noun
  1. a distinctly protruding, often wide lower jaw.
  2. a long, thin jaw.
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Origin of lantern jaw

First recorded in 1690–1700; so called from the fancied resemblance of the face to the shape of a lantern
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for lantern jaw

lantern jaw

noun
  1. (when plural, refers to upper and lower jaw; when singular usually to lower jaw) a long hollow jaw that gives the face a drawn appearance
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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

lantern jaw in Medicine

lantern jaw

(lăntərn)
n.
  1. A lower jaw that protrudes beyond the upper jaw.
  2. A long, thin jaw that gives the face a gaunt appearance.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.