/di fraw"steuhr, -fros"teuhr/ , n.
1. a person or thing that defrosts.
2. Also called defogger; esp. Brit., demister . a device for melting frost, ice, or condensation on a windshield or other window of an automobile, airplane, etc., by warming the window.
[ 1925-30; DEFROST + -ER 1 ]