/ Dictionary / Index H hydrocinnamic acid: Meaning and Definition of Find definitions for: hy'dro•cin•nam'ic ac'id Pronunciation: (hī'drō-si-nam'ik, -dru-sin'u-mik, hī"-), [key] a white crystalline compound, CHO, with a floral odor, used in perfumes and flavoring. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydrochlorothiazide hydrocinnamic aldehyde Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language