frost¹/frɔst; frɒst/ n 1 [U] a white powder of ice, which forms on surfaces outside when the temperature is very cold (白)霜: trees covered with frost 盖满白霜的树木 2 [C] very cold weather, when water freezes 严寒天气,冰冻(期): an early frost 早寒,秋霜 a hard frost (=extremely cold weather) 天寒地冻