a distinctly protruding, often wide lower jaw.
a long, thin jaw.
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. 2019
(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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
A lower jaw that protrudes beyond the upper jaw.
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.