[ dih-fraw-ster, -fros-ter ]
/ dɪˈfrɔ stər, -ˈfrɒs tər /


a person or thing that defrosts.
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 of defroster

First recorded in 1925–30; defrost + -er1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for defroster

  • The metal felt cold, like the window of the car on a day when you needed the heater and defroster.

    First Man|Clyde Brown

British Dictionary definitions for defroster


/ (diːˈfrɒstə) /


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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012