/ Dictionary / Index H hydrocinnamic aldehyde: Meaning and Definition of Find definitions for: hy'drocinnam'ic al'dehyde Pronunciation: (hī'drō-sin"u-mal'du-hīd"). [key] a colorless liquid, CHO, having a floral odor, used in perfumery and flavoring. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydrocinnamic acid hydrocolloid Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language