Pronunciation: (mOOs), [key]
a. a sweetened dessert with whipped cream as a base, often stabilized with gelatin and chilled in a mold: chocolate mousse.
b. an aspic, unsweetened and containing meat, vegetables, or fish: salmon mousse.
2. a foamy preparation used on the hair to help hold it in place, applied usually to damp hair before grooming or styling and worked in until absorbed.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.