underbite

[uhn-der-bahyt]
noun Dentistry.
occlusion in which the lower incisor teeth overlap the upper.

Origin:
1975–80; under- + bite

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American Heritage
Medical Dictionary

underbite un·der·bite (ŭn'dər-bīt')
n.
Malocclusion in which the lower teeth overlap the upper teeth.

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
He's got a little underbite which endears him to absolutely everyone.
Cahill has a speech impediment and underbite that affect his ability to
  articulate certain sounds and words.
Tooth wear was not appropriate for aging wolves with an underbite that
  prevented normal wear or severely broken and missing teeth.
Services for the treatment of an overbite or underbite.
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