A visible collection of minute particle matter, such as water droplets and/or ice crystals, in the free air. A cloud forms in the atmosphere as a result of condensation of water vapor. Condensation nuclei, such as in smoke or dust particles, form a surface upon which water vapor can condense.
CLOUD
Meaning of CLOUD in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012