/ Dictionary / Index M mol. wt.: Meaning and Definition of Find definitions for: mol. wt. Pronunciation: [key] molecular weight. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. molvi moly Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language