Definition of defrost verb from the Oxford Advanced American Dictionary

defrost

verb
/dɪˈfrɔst/
 
 
1 [intransitive, transitive] to become or make something warmer, especially food, so that it is no longer frozenIt will take about four hours to defrost. defrost somethingMake sure you defrost the chicken completely before cooking.2 [transitive, intransitive] defrost (something) when you defrost a refrigerator or freezer, or when it defrosts, you remove the ice from it compare de-ice, melt, thaw, unfreeze3 [transitive] defrost something to remove ice from the surface of a car's windows defroster
 
noun
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