: a product or material that adds fullness or volume to something
especially: a product used to make hair appear thicker or fuller
Spray one of the new liquid volumizers that enhance your hair's natural texture on towel-dried tresses, then blow-dry or let air-dry. —Cosmopolitan, January 2000
I don't want to ever be without this perfect product—it's a volumizer for intense eyes that requires only one coat because the exceptional wand spreads and coats the lashes so beautifully. —Amanda Barrett, Chicago-Sun Times, 25 Aug. 2011