...Bear's home is discovered by means of the tiny hole in the roof aroundwhich is collected quantities of hoar frost... 
Royal Dixon 「The Human Side of Animals」
...The deposition of water inthe form of snow, or even of hoar frost, would at least imply that theatmosphere of Mars should now and then display traces of aqueous vapour,which it does not appear to do...
Cecil G. Dolmage 「Astronomy of To-day」
...Another cold night, thermometer 26°, witha slight hoar frost...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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