/ Dictionary / Index M monohydrate: Meaning and Definition of Find definitions for: mon•o•hy•drate Pronunciation: (mon"u-hī'drāt), [key] — n. Chem. a hydrate that contains one molecule of water, as ammonium carbonate, (NH)CO&syl;HO. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monohydrate (Thesaurus) monohybrid monohydric Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language