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Feb 12, 2012
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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.

arcuationarcus senilis
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