/ Dictionary / Index H hyponitrous: Meaning and Definition of Find definitions for: hy•po•ni•trous Pronunciation: (hī"pu-nī'trus), [key] — adj. of or derived from hyponitrous acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hyponitrite hyponitrous acid Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language