Opisthognathous
ahd-5
adjective.
Having receding jaws or mouthparts directed backward.
The Century Dictionary and Cyclopedia
In
anthropology
, having retreating jaws or teeth: the opposite of
prognathous
.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
having receding jaws
Equivalent
chinless