Yes, "defrost" is an official, fully recognized standard word in the English language with established dictionary definitions as both a transitive and intransitive verb. It combines the prefix de- (meaning to remove or reverse) with the root word frost, creating a precise term for melting ice or removing frost from surfaces, appliances, and food items. It appears regularly in user manuals, culinary recipes, and meteorological instructions. You can verify its validity by checking any major English dictionary publication, such as Merriam-Webster or the Oxford English Dictionary.
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