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Dictionary

ar•cus

Pronunciation: (är'kus), [key]
—n.,
—pl. -cus. Meteorol.
a dense, horizontal, roll-shaped cloud sometimes occurring at the lower front portion of a cumulonimbus. Also called roll cloud.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

arcuation

arcus senilis

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