/ Dictionary / Index M moisten: Meaning and Definition of Find definitions for: mois•ten Pronunciation: (moi'sun), [key] — v.t., v.i. to make or become moist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: moisten (Thesaurus) moist moisture Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language