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English word cumulonimbus comes from Latin nimbus, Latin cumulus (Heap, pile. Summit. Surplus.)
nimbus (Latin)
(figuratively) calamity, tempest. Cloud. Halo (visible aura of divine power). Rain cloud, thunder cloud. Rainstorm, rain shower. Throng.
cumulus (Latin)
Heap, pile. Summit. Surplus.
cumulonimbus (English)
A cloud, with a tall structure and a flat base, that is often associated with thunderstorms.