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Definition of CLOUD
: a visible mass of particles of condensed vapor (as water or ice) suspended in the atmosphere of a planet (as the earth) or moon
: 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>
: something that has a dark, lowering, or threatening aspect <clouds of war><a cloud of suspicion>
: something that obscures or blemishes <a cloud of ambiguity>
: a dark or opaque vein or spot (as in marble or a precious stone)
: the computers and connections that support cloud computing <storing files in the cloud>
Any visible mass of water droplets, ice crystals, or a mixture of the two that is suspended in the air, usually at a considerable height. Clouds are usually created and sustained by upward-moving air currents. Meteorologists classify clouds primarily by their appearance. The 10 main cloud families are divided into three groups on the basis of altitude. High clouds, which are found at mean heights of 45,000–16,500 ft (13–5 km), are, from highest to lowest, cirrus, cirrocumulus, and cirrostratus. Middle clouds, at 23,000–6,500 ft (7–2 km), are altocumulus, altostratus, and nimbostratus. Low clouds, at 6,500–0 ft (2–0 km), are stratocumulus, stratus, cumulus, and cumulonimbus. A shallow layer of cloud at or near ground level is called fog.