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

(meteorology) polar stratospheric cloud

(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.

(meteorology) Stratocumulus.

(Internet) A visual depiction of a set of tags, typically used to describe the content of web sites and having the more significant tags shown in correspondingly larger text or a bolder font.

The act of firing munitions containing silver iodide at passing clouds to make them more likely to produce rain.

(Internet) tag cloud

Alternative spelling of cloud seeding

(meteorology) The percentage or fraction of the sky obscured by clouds.