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black frost

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noun
  1. intense cold without hoarfrost, causing vegetation to turn black.Compare frost(def 2).
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Origin of black frost

First recorded in 1700–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for black frost

black frost

noun
  1. a frost without snow or rime that is severe enough to blacken vegetation
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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