mousse /muːs/ BrE AmE noun [uncountable and countable]
[ Date: 1800-1900 ; Language: French ; Origin: 'moss, froth' ]
1 .
a) a sweet food made from a mixture of cream, eggs, and fruit or chocolate, which is eaten when it is cold:
chocolate mousse
raspberry mousse
b) a food that is mixed and cooked with cream or eggs so that it is very light:
salmon mousse
2 . a substance full of small bubbles that you put in your hair to make it look thicker or to hold its style in place