Definitions for hoarfrostˈhɔrˌfrɔst, -ˌfrɒst, ˈhoʊr-
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Random House Webster's College Dictionary
hoar•frostˈhɔrˌfrɔst, -ˌfrɒst, ˈhoʊr-(n.)
Category: Meteorology
Ref: frost (def. 2). 1 2
Origin of hoarfrost:
1250–1300
Princeton's WordNet
frost, hoar, hoarfrost, rime(noun)
ice crystals forming a white deposit (especially on objects outside)
Wiktionary
hoarfrost(Noun)
Dew-drops which have undergone deposition and frozen into ice crystals to form a white deposit on an exposed surface, when the air is cold and moist.
Webster Dictionary
Hoarfrost(noun)
the white particles formed by the congelation of dew; white frost
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