lantern jaw

a distinctly protruding, often wide lower jaw.
a long, thin jaw.

1690–1700; so called from the fancied resemblance of the face to the shape of a lantern Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lantern jaw
n (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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

lantern jaw lan·tern jaw (lān'tərn)

  1. A lower jaw that protrudes beyond the upper jaw.

  2. A long, thin jaw that gives the face a gaunt appearance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The lantern jaw fastens below them, studded with teeth.
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