n. A device for removing frost or ice from a surface or food by applying heat
the GNU version of the Collaborative International Dictionary of English
n. A device that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane).
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane)
Word Usage
"I have a newly re-engined 1978 Mustang that is about as basic as you can get; it has a rear-window defroster, which is constantly failing and twice shorted out and shattered the window."