Pronunciation: (di-frô'stur, -fros'tur), [key]
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.