/ Dictionary / Index H hydroforming: Meaning and Definition of Find definitions for: hy•dro•form•ing Pronunciation: (hī'dru-fôr"ming), [key] — n. the production of high-octane aromatic compounds for motor fuels by catalytic reforming of naphthas in the presence of hydrogen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydrofoil hydroformylation Related Content Daily Word Quiz: drowsy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language