Meaning

noun a rich, frothy, creamy dessert made with whipped egg whites and heavy cream

noun a light creamy dish made from fish or meat and set with gelatin

noun toiletry consisting of an aerosol foam used in hair styling

originFrom French mousse (“foam, froth”), from Old French mosse (“moss”), from Frankish or Old Dutch *mosa (“moss”), from Proto-Germanic *musą (“moss, bog, marsh”). More at moss.

Etymology from Wiktionary, CC BY-SA 3.0