(physics) A mathematically defined region around an atomic nucleus defined by a high probability that the atom's electrons will be present in that region.

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

polar stratospheric cloud

(meteorology) A cellular pattern of pouches hanging underneath the base of a cloud.

plural of cloud base

plural of cloud point

Any of the dust clouds found at the Trojan points, the L4 and L5 Lagrange points, in the Earth-Moon system, and of any other such system

A generally tropical or subtropical, evergreen, montane, moist forest characterized by a persistent, frequent or seasonal low-level cloud cover, usually at the canopy level.