a mass of water or ice particles visible in the sky, usually white or grey, from which rain or snow falls when the particles coagulate

any collection of particles visible in the air, esp of smoke or dust

a large number of insects or other small animals in flight

something that darkens, threatens, or carries gloom

a cloudlike blemish in a transparent stone

of or relating to cloud computing

to make or become cloudy, overcast, or indistinct

to make obscure; darken

to confuse or impair

to make or become gloomy or depressed

to place under or render liable to suspicion or disgrace

to render (liquids) milky or dull or (of liquids) to become milky or dull

to become or render mottled or variegated

a visible mass of tiny, condensed water droplets or ice crystals suspended in the atmosphere: clouds are commonly classified in four groups: A (high clouds above 6,096 m or 20,000 ft) cirrus, cirrostratus, cirrocumulus; B (intermediate clouds, 1,981 m to 6,096 m or 6,500 to 20,000 ft) altostratus, altocumulus; C (low clouds, below 1,981 m or 6,500 ft) stratus, stratocumulus, nimbostratus; D (clouds of great vertical continuity) cumulus, cumulonimbus

a mass of smoke, dust, steam, etc.

a great number of things close together and in motion

an appearance of murkiness or dimness, as in a liquid

a dark marking, as in marble

anything that darkens, obscures, threatens, or makes gloomy

to cover or make dark as with clouds

to make muddy or foggy

to darken; obscure; threaten

to make gloomy or troubled

to cast slurs on; sully (a reputation, etc.)

to become cloudy

to become gloomy or troubled