Both defrost and defreeze are technically real English words, but "defrost" is vastly more common, standard, and widely accepted in both everyday speech and technical manuals. While "defreeze" logically means to undo a freeze, it is rarely used by native speakers or appliance manufacturers. Dictionaries list "defrost" as the primary standard term for clearing ice off windshields, thawing food, and melting freezer coils, whereas "defreeze" is often treated as archaic or non-standard. You can verify correct usage by choosing "defrost" in all professional, technical, and casual writing contexts.
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