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Vinony

cumulonimbus

noun

  1. genus of clouds, dense towering vertical cloud associated with thunderstorms and atmospheric instability
L318955 on Wikidata ↗

Wiktionary

Pronunciation: /ˌkjuː.mjʊ.ləʊˈnɪm.bəs/ / /ˌkju.mjə.loʊˈnɪm.bəs/

noun

Etymology: From Latin cumulus (“heap”) + nimbus (“cloud”).

  1. A cloud with a tall structure and flat base, often associated with thunderstorms.

    “The one to the east (which at the moment seemed to be leaping straight out of the heart of a sinister slaty-purple patch of cumulonimbus) drained the Lake of the Hanging Glaciers; that to the west a desolate rock and ice-walled valley which was rimmed by some of the highest summits in the Selkirks.”