having the lower jaw or mandible longer than the upper.

1870–75; hypo- + -gnathous

hypognathism, noun
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World English Dictionary
hypognathous (haɪˈpɒɡnəθəs)
1.  having a lower jaw that protrudes beyond the upper jaw
2.  (of insects) having downturned mouthparts

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hypognathous hy·pog·na·thous (hī-pŏg'nə-thəs, hī'pō-nāth'əs)
Having a congenitally underdeveloped lower jaw.

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
The hypognathous condition, with the mouthparts in a continuous series with the legs, is probably primitive.
Head hypognathous, broadly oval, flat from lateral view.
Head pro-hypognathous, oval, more or less flat from lateral view.
Head pro-hypognathous, more or less flat from lateral view.
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