Noun
Originally, any frozen dew forming a white deposit on exposed surfaces.
Coordinate terms: dew, glaze, rime
(specifically, meteorology) Water vapour which has undergone deposition or desublimation (“transformation directly into ice crystals without first turning into liquid water”) when the air is cold and moist to form a white deposit on exposed surfaces.
hoar-frost (countable and uncountable, plural hoar-frosts)
Alternative form of hoar frost
hoar-frost