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air frost

British  

noun

  1. the deposition of ice condensed from water vapour in the atmosphere on the surface when the air temperature is below 0°C

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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In England it would represent the earliest air frost in five years, and in Northern Ireland the earliest in six.

From BBC • Sep. 12, 2024

As winds fall lighter overnight it is even possible that Friday morning could start with an air frost - where temperatures drop below freezing.

From BBC • Sep. 12, 2024

If a weather station in Wales drops below 0C it will be the earliest air frost since 1996.

From BBC • Sep. 12, 2024

Cold and nipping air, frost on everything, pale stars, a gold-red light in the east were proofs that I was again in the open.

From Tales of lonely trails by Grey, Zane

In the making of soils, a process that is constantly going on, the most important agents are water, air, frost, sunshine, and the action of living organisms.

From The Apple by Various

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