Breadcrumb Home > Dictionary > Index H hydrolysis: Meaning and Definition of Find definitions for: hy•drol•y•sis Pronunciation: (hī-drol'u-sis), [key] — pl. -ses chemical decomposition in which a compound is split into other compounds by reacting with water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydrolysis (Thesaurus) hydrolysate hydrolyte ✖ Related Content Daily Word Quiz: triumphalism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language