(astronomy) A roughly spherical region of space composed of comet-like bodies and other minor planets and asteroids that orbit distantly in a planetary system.

Alternative form of Oort Cloud (the Solar System's Oort cloud)

unsubstantial or imaginary.

(meteorology) Stratocumulus.

(chemistry) The temperature at which one component of a mixture of liquids begins to solidify (or a mixture of liquids starts to become immiscible) on cooling, resulting in visible cloudiness; as for example in diesel fuel in freezing temperatures; the consolute point

(meteorology) A high-altitude cloud that is shaped like a lens.

A form of atmospheric pollution, a mixture of aerosols that absorb and scatter light, resulting from the burning of biomass and fossil fuel.

(informal, computing) Computing services provided over the Internet (or "cloud"), whereby shared resources, software, and information are provided to computers and other devices on demand.

Alternative form of cloudburst

A large rain cloud, with potential to bring a storm.