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arcus: Meaning and Definition of

ar•cus

Pronunciation: (är'kus), [key]
— pl. -cus.
  1. a dense, horizontal, roll-shaped cloud sometimes occurring at the lower front portion of a cumulonimbus. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
arcuation arcus senilis
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