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English definition of “frost”

frost

noun [C or U]     /frɒst/ US  /frɑːst/
B2 (a period of time in which there is) an air temperature below the freezing point of water, or the thin, white layer of ice which forms in these conditions, especially outside at night: There was a frost last night. When I woke up this morning the ground was covered with frost. There were a lot of hard/heavy (= severe) frosts that winter.Snow and iceCold
(Definition of frost noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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