/ Dictionary / Index H hydronitrogen: Meaning and Definition of Find definitions for: hy•dro•ni•tro•gen Pronunciation: (hī"dru-nī'tru-jun), [key] — n. a chemical compound containing only hydrogen and nitrogen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydronic hydronium ion Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language