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[ahr-kuh s] /ˈɑr kəs/
noun, plural arcus. Meteorology.
a dense, horizontal, roll-shaped cloud sometimes occurring at the lower front portion of a cumulonimbus.
Also called roll cloud.
Origin of arcus
< Latin: bow, arch Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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arcus in Medicine

arcus ar·cus (är'kəs)
n. pl. arcus
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.
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