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Verb: defrost  dee'fróst or di'fróst
  1. Make or become free of frost or ice
    "Defrost the car window";
    - deice, de-ice

Derived forms: defrosts, defrosted, defrosting

Type of: dethaw, dissolve, melt, thaw, unfreeze, unthaw [N. Amer]

Encyclopedia: Defrost