/ Dictionary / Index T trihydrate: Meaning and Definition of Find definitions for: tri•hy•drate Pronunciation: (trī-hī'drāt), [key] — n. Chem. a hydrate that contains three molecules of water, as potassium pyrophosphate, KPO&multiplydot;3HO. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trihedron trihydric Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language