The Collaborative International Dictionary of English v.0.48:

Mousseline \Mousse`line"\, n. [F.]
   Muslin.
   [1913 Webster]

   Mousseline de laine. [F., muslin of wool.] Muslin delaine.
      See under Muslin.

   Mousseline glass, a kind of thin blown glassware, such as
      wineglasses, etc.
      [1913 Webster]