/ Dictionary / Index H hemihydrate: Meaning and Definition of Find definitions for: hem•i•hy•drate Pronunciation: (hem"i-hī'drāt), [key] — n. Chem. a hydrate in which there are two molecules of the compound for each molecule of water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hemihedral hemikaryon Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language