White Frost is a type of frost that appears on surfaces when the temperature drops below freezing. It is made up of tiny ice crystals and is usually white in color. The two crossword solutions for White Frost are HOAR and RIME. HOAR is an old English word meaning frost or hoarfrost, while RIME is a type of frozen dew that forms on surfaces when the air is cold and humid. Both words refer to the same phenomenon of White Frost.