/ Dictionary / Index H hydrocracking: Meaning and Definition of Find definitions for: hy•dro•crack•ing Pronunciation: (hī'dru-krak"ing), [key] — n. the cracking of petroleum or the like in the presence of hydrogen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydrocracking (Thesaurus) hydrocracker hydrocyanic Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language