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hoarfrost

[hawr-frawst, -frost, hohr-] /ˈhɔrˌfrɔst, -ˌfrɒst, ˈhoʊr-/
noun
1.
frost (def 2).
Origin of hoarfrost
1250-1300
1250-1300; Middle English hor-frost. See hoar, frost
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for hoarfrost

hoarfrost

/ˈhɔːˌfrɒst/
noun
1.
a deposit of needle-like ice crystals formed on the ground by direct condensation at temperatures below freezing point Also called white frost
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
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Word Origin and History for hoarfrost
n.

c.1300, hore-forst; see hoar + frost (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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hoarfrost in Science
hoarfrost
  (hôr'frôst')   
Frozen dew that forms a white coating on a surface.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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15
14
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