defroster

[dih-fraw-ster, -fros-ter]
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.

Origin:
1925–30; defrost + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
defroster (diːˈfrɒstə)
 
n
a device by which the de-icing process of a refrigerator is accelerated, usually by circulating the refrigerant without the expansion process

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
For one thing, in the first couple of minutes, there is basically no heat
  coming from the defroster: it is not melting anything.
Turn on your windshield wipers, low-beam headlights, and defroster.
Warm up the car so the defroster has a chance to clear the windows.
Turn on your windshield wipers, headlights, and defroster.
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