(astronomy) A large group of many stars spread over very many light-years of space; the stars are not part of any structure but are in an area of greater than average stellar density.

A tall, distinctively anvil-shaped thundercloud.

The altitude of the base of a mass of cloud; measured by a ceilometer.

A wall of clouds, rising above horizon or observed from a distance, but not overhead.

A cloud from which rain is falling or may fall.

plural of cloud forest

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.

A particle detector used for detecting ionizing radiation. In its most basic form, it is a sealed environment containing a supersaturated vapor of water or alcohol, in which a mist can be seen where a charged particle interacts with the mixture and it ionizes it.

plural of cloud chamber

Auricularia polytricha, syn. Hirneola polytricha, an edible jelly fungus often used in Asian cooking.