defroster

noun

1. a person or thing that defrosts.
2. Also called defogger; especially British, demister. a device for melting frost, ice, or condensation on a windshield or other window of an automobile, airplane, etc., by warming the window.

noun

1. a device by which the de-icing process of a refrigerator is accelerated, usually by circulating the refrigerant without the expansion process