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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Learned borrowing from Latin nimbus (“dark cloud”). Doublet of nimb. Sense 2 (“grey rain cloud”) was coined by the British chemist and amateur meteorologist Luke Howard (1772–1864): see the 1803 quotation.
nimbus cloud, rain cloud
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Classic usage
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