(1) Thin ice crystals in the shape of scales, needles, feathers or fans which are deposited by Sublimation at temperatures of 32°F (0°C) or lower. (2) A temperature low enough to cause freezing. (3) The process of freezing.
FROST
Meaning of FROST in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012