/ Dictionary / Index M mousseline de laine*: Meaning and Definition of Find definitions for: mousse•line de laine Pronunciation: (ms-lēn du len'), [key] — French. French. a thin worsted fabric, often having a printed pattern. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mousseline mousseline de soie* Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language