/ Dictionary / Index H hypognathous: Meaning and Definition of Find definitions for: hy•pog•na•thous Pronunciation: (hī-pog'nu-thus), [key] — adj. having the lower jaw or mandible longer than the upper. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hypognathous (Thesaurus) hypoglycemia hypogonadism Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language