/ ˌdiːˈfrɒst; NAmE -ˈfrɔːst/ verb
1.
to become or make sth warmer, especially food, so that it is no longer frozen :
[ vn ]
Make sure you defrost the chicken completely before cooking.
[ v ]
It will take about four hours to defrost.
2.
[ vn , v ] when you defrost a fridge / refrigerator or freezer , or when it defrosts , you remove the ice from it
—compare de-ice , melt , thaw , unfreeze
3.
[ vn ] ( NAmE ) to remove ice from the surface of a car's windows
► de·frost·er noun