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English definition of “frost”

frost

noun     /frɒst/ US  /frɑːst/
B2 [U] the thin, white layer of ice that forms when the air temperature is below the freezing point of water, especially outside at night: When I woke up this morning the ground was covered with frost.Snow and iceCold B2 [C or U] a weather condition in which the air temperature falls below the freezing point of water, especially outside at night: There was a frost last night. 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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