mousseline

noun4

1. •
   A soft, light sweet or savoury mousse.
2. •
   A hollandaise sauce that has been made frothy with whipped cream or egg white, served mainly with fish or asparagus.
3. •
   A very fine, semi-opaque fabric similar to muslin, typically made of silk, wool or cotton.
4. •
   A very thin glass for claret glasses.