Simple past tense and past participle of defrost.(verb)
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Use "defrosted" in a sentence
"Freezing to such extreme temperatures completely stops all microbiological activity, and when defrosted is actually closer to ‘fresh’ than never-frozen fish, which can sometimes go at least a week from capture to being delivered to your local fishmonger."
"I think folding some fresh aka defrosted cranberries through the whipped cream would be a great idea to really bring out that tart Christmassy flavour."
"The search for strike weapons goes on – Tommaso Benvenuti, an exciting young centre, needs to be integrated, and Sergio Parisse needs to be cryogenically frozen for eternity, defrosted only on match-days."