/frɒst; US frɔ:st ||; frɔst/noun [C,U] the weather condition when the temperature falls below 0° Celsius (freezing point) and a thin layer of ice forms on the ground and other surfaces, especially at night 严寒，霜冻（冰点以下结霜的天气状况）: There was a hard frost last night. 昨晚有严重霜冻。It will be a chilly night with some ground frost. 今晚将很寒冷，地面会有霜冻。