(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.

polar stratospheric cloud

plural of anvil cloud

plural of Magellanic Cloud

(astronomy) collectively, the pair of galaxies, the Large Magellanic Cloud and Small Magellanic Cloud; also sometimes includes the Magellanic Bridge and Magellanic Stream.

plural of electron cloud

(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.

A subgrouping of standard cloud classification system, coming after the major cloud genera

(meteorology) Grouping of the standard cloud classification system. Members include cirrus, cirrocumulus, cirrostratus, altocumulus, altostratus, nimbostratus, stratocumulus, stratus, cumulus, and cumulonimbus.

plural of mushroom cloud