The American Heritage® Dictionary of the English Language, 4th Edition
n. The lower jaw or mandible, especially in humans.
The Century Dictionary and Cyclopedia
n. The under jaw or mandible; especially, the submaxillary bone, or bone of the under jaw.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the jaw in vertebrates that is hinged to open the mouth
Word Usage
"Although an animal suffering with a complete and often compound and comminuted fracture of the submaxilla presents at times a serious aspect, the prognosis of the case is comparatively favorable, and recovery is usually only a question of time."