/ Dictionary / Index H hydrogenate: Meaning and Definition of Find definitions for: hy•dro•gen•ate Pronunciation: (hī'dru-ju-nāt", hī-droj'u-), [key] — -at•ed, -at•ing. to combine or treat with hydrogen, esp. to add hydrogen to the molecule of (an unsaturated organic compound). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydrogenate (Thesaurus) hydrogen hydrogen bomb Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language