Meaning of “frost” in the English Dictionary

"frost" in British English

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frostnoun

uk /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.

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.

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frostverb

uk /frɒst/ us /frɑːst/

(Definition of “frost” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"frost" in American English

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frostnoun [ U ]

us /frɔst/

frost noun [ U ] (WHITE LAYER)

earth science water in the air that freezes when it touches a cold surface and forms a white, powdery layer:

There was frost on the grass in the early morning.
An early frost killed some of my tomatoes.

frostverb

us /frɔst/

frost verb (COVER CAKE)

[ T ] also ice to cover a cake with a thin layer of sugar mixed with a liquid

frost verb (COVER WITH ICE)

[ I/T ] to cover or become covered with a white, powdery layer of ice :

[ I ] The windshield frosted up overnight.

(Definition of “frost” from the Cambridge Academic Content Dictionary © Cambridge University Press)