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arcus

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WordReference Random House Unabridged Dictionary of American English © 2026

ar•cus n., pl. -cus. [Meteorol.]

Meteorologya dense, horizontal, roll-shaped cloud sometimes occurring at the lower front portion of a cumulonimbus. Also called roll cloud.

Latin: bow, arch

'arcus' also found in these entries (note: many are not synonyms or translations):

arbalest - arc - arcade - arch - archer - archivolt - arciform - arco - arcuate - arcus senilis - arrow - roll cloud

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