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apertognathia

(ə-pûr′tŏg-nāthē-ə, -tō-năthē-ə)
n.
  1. A type of malocclusion characterized by the premature occlusion of posterior teeth and the absence of anterior occlusion.open bite
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.