noun (used with a singular or plural verb) Meteorology.
- streaks of water drops or ice particles falling out of a cloud and evaporating before reaching the ground (distinguished from praecipitatio).
noun
- (sometimes functioning as plural) meteorol wisps of rain or snow, seen trailing from clouds, that evaporate before reaching the earth
- Light wisps of precipitation streaming from a cloud but evaporating before reaching the ground, especially when the air below is low in humidity.