Source : Webster's Revised Unabridged Dictionary (1913)

Mousse \Mousse\ (m[=oo]s), n. [F.] (Cookery)
   A frozen dessert of a frothy texture, made of sweetened and
   flavored whipped cream, sometimes with the addition of egg
   yolks and gelatin. Mousse differs from ice cream in being
   beaten before -- not during -- the freezing process.

Source : WordNet®

mousse
     n 1: a light creamy dessert set with gelatin
     2: a light creamy dish made from fish or meat and set with
        gelatin
     3: toiletry consisting of an aerosol foam used in hair styling
        [syn: {hair mousse}, {hair gel}]
     v : apply a styling gel to; "she mousses her hair" [syn: {gel}]