Definitions:

1. a light creamy dish made from fish or meat and set with gelatin noun
   • I spread salmon mousse onto my cracker.
2. a rich, frothy, creamy dessert made with whipped egg whites and heavy cream noun
   • Chocolate mousse is a delicious dessert.
3. to apply a styling gel to verb
   • You mousse your hair.
4. toiletry consisting of an aerosol foam used in hair styling noun
   • I bought some mousse to keep my hair in place.

Synonyms:

• gel
• hair gel
• hair mousse