/ Dictionary / Index H hypoth.: Meaning and Definition of Find definitions for: hypoth. Pronunciation: [key] hypothesis. hypothetical. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hypotenuse hypothalamus Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language