mousseline /mo͞osəˈlēn mo͞oˈslēn/ I. noun 1. a fine, semiopaque fabric similar to muslin, typically made of silk, wool, or cotton. 2. a soft, light mousse. 3. (also sauce mousseline) — hollandaise sauce that has been made frothy with whipped cream or egg white, served mainly with fish or asparagus. – origin late 17th cent.: from French (see muslin).
