[mousse] n [F, lit., froth, moss, of Gmc origin; akin to OHG mos moss--more at moss] (1892) 1: a light spongy food usu. containing cream or gelatin
2: a molded chilled dessert made with sweetened and flavored whipped cream or egg whites and gelatin "chocolate ~"
3: a foamy preparation used in styling hair
[2]mousse vt moussed ; mouss.ing (1984): to style (hair) with mousse