mousse

Concise Oxford English Dictionary © 2008 Oxford University Press:
mousse/muːs/

▶noun

• 1 a sweet or savoury dish made as a smooth light mass in which the main ingredient is whipped with cream or egg white.

• 2 a soft, light, or aerated preparation for the skin or hair.

▶verb style (hair) using mousse.

– origin C19: from Fr., ‘moss or froth’.