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