mousse / moōs/ • n. a sweet or savory dish made as a smooth light mass with whipped cream and beaten egg white, flavored with chocolate, fish, etc., and typically served chilled: roulade of sole with a lobster mousse | dark chocolate mousse. ∎  a soft, light, or aerated gel such as a soap preparation: fragrant shower mousse. ∎  a frothy preparation that is applied to the hair, enabling it to be styled more easily. ∎  (also chocolate mousse) a brown frothy emulsion of oil and seawater formed by weathering of an oil slick.• v. [tr.] style (hair) using mousse.

mousse Light frothy dish based on white or custard sauce or fruit purée to which eggs, whipped cream and sometimes gelatine are added. May be sweet or savoury, served hot or cold.

mousse XIX. — F., ‘moss’.