/ Dictionary / Index H hydrated: Meaning and Definition of Find definitions for: hy•drat•ed Pronunciation: (hī'drā-tid), [key] — adj. chemically combined with water in its molecular form. (of paper pulp) beaten until gelatinous for making into water-resistant paper. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydrated (Thesaurus) hydrate hydrated alumina 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