Thawed out from a frozen state; no longer frozen.
Past participle of defrost, from de- (reversal) + frost. The word was coined in the mid-20th century alongside home refrigerators, which created the practical need for this everyday term.
Defrost is one of the few de- words that became completely commonplace—you won't find medieval texts about defrosts because freezing food wasn't normal until electric refrigeration existed.
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