arcus

[ahr-kuh s]
noun, plural ar·cus. Meteorology.
  1. a dense, horizontal, roll-shaped cloud sometimes occurring at the lower front portion of a cumulonimbus.

Origin of arcus

< Latin: bow, arch
Also called roll cloud.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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arcus in Medicine

arcus

[ärkəs]
n. pl. arcus
  1. A structure resembling a bent bow or an arch.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.