/ Dictionary / Index H hypotenuse: Meaning and Definition of Find definitions for: hy•pot•e•nuse Pronunciation: (hī-pot'n-s", -ys"), [key] — n. Geom. the side of a right triangle opposite the right angle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hypotenuse (Thesaurus) hypotensive hypoth. Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language