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Middle English, rock or rock hill (clod), from Old English clūd


  • 1: a visible mass of particles of condensed vapor (as water or ice) suspended in the atmosphere of a planet (as the earth) or moon
  • 2: something resembling or suggesting a cloud: as a : a light filmy, puffy, or billowy mass seeming to float in the air <a cloud of blond hair> <a ship under a cloud of sail>
b (1) : a usually visible mass of minute particles suspended in the air or a gas (2) : an aggregation of usually obscuring matter especially in interstellar space (3) : an aggregate of charged particles (as electrons)
c : a great crowd or multitude : swarm <clouds of mosquitoes>
  • 3: something that has a dark, lowering, or threatening aspect <clouds of war> <a cloud of suspicion>
  • 4: something that obscures or blemishes <a cloud of ambiguity>
  • 5: a dark or opaque vein or spot (as in marble or a precious stone)


A cloud is a visible mass of liquid droplets or frozen crystals made of water and/or various chemicals suspended in the atmosphere above the surface of a planetary body. They are also known as aerosols. Clouds in Earth's atmosphere are studied in the cloud physics branch of meteorology. Two processes, possibly acting together, can lead to air becoming saturated: cooling the air or adding water vapor to the air. In general, precipitation will fall to the surface; an exception is virga, which evaporates before reaching the surface.

Clouds can show convective development like cumulus, appear in layered sheets such as stratus, or take the form of thin fibrous wisps, as in the case of cirrus. Prefixes are used in connection with clouds: strato for low cumuliform-category clouds that show some stratiform characteristics, nimbo for thick stratiform clouds that can produce moderate to heavy precipitation, alto for middle clouds, and cirro for high clouds. Whether or not a cloud is low, middle, or high level depends on how far above the ground its base forms.

Cloud types with significant vertical extent can form in the low or middle ranges depending on the moisture content of the air. Clouds in the troposphere have Latin names due to the popular adaptation of Luke Howard's cloud categorization system, which began to spread in popularity during December 1802. Synoptic surface weather observations use code numbers for the types of tropospheric cloud visible at each scheduled observation time based on the height and physical appearance of the clouds.

While a majority of clouds form in Earth's troposphere, there are occasions where clouds in the stratosphere and mesosphere are observed. Clouds have been observed on other planets and moons within the Solar System, but, due to their different temperature characteristics, they are composed of other substances such as methane, ammonia, and sulfuric acid.[1]

See also


For only when you experience the stillness are you in complete knowledge of His presence and only as you carry your understanding of grace with you into your arena are you capable of maintaining that quality which allows you to prevail with men in such a way as to maintain your own sense of balance and solidarity -- that is to say: your head in the clouds and your feet on the ground -- and this condition is evidence of a well-unified personality operating in the fullest capacity known to him at that time. - Tomas