hoar

[hawr, hohr]
noun
1.
hoarfrost; rime.
2.
a hoary coating or appearance.
adjective

Origin:
before 900; Middle English hor, Old English hār; cognate with Old Norse hārr gray with age, Old Frisian hēr gray, Old High German hēr old (German hehr august, sublime)

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World English Dictionary
hoar (hɔː)
 
n
1.  short for hoarfrost
 
adj
2.  rare covered with hoarfrost
3.  archaic a poetic variant of hoary
 
[Old English hār; related to Old Norse hārr, Old High German hēr, Old Slavonic sěrǔ grey]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

hoar
O.E. har "gray, venerable, old," the connecting notion being gray hair, from P.Gmc. *khairaz, from PIE *koi- "to shine." German retains the word as a title of respect, in Herr. Of frost, it is recorded in O.E. (hoar-frost is late 13c.), expressing the resemblance of the white feathers of frost to an
old man's beard. Used as an attribute of boundary stones in O.E. (probably in ref. to being gray with lichens), hence common in place names.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They're trying to understand hoar, frozen dew layers that can shatter when
  buried under snow, triggering an avalanche.
But with the hoar of the years, this tentativeness seems a welcome sign of
  humility.
The white button of a polar cap is a region covered thinly with hoar frost
  rather than heavily laden with ice and snow.
The cow got nourishment by licking the hoar frost and salt from the ice.
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