/ Dictionary / Index B black molly: Meaning and Definition of Find definitions for: black' mol'ly Pronunciation: [key] a jet-black molly, a color form esp. of Poecilia latipinna or P. sphenops, popular as an aquarium fish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. black mold black money Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language