arcus

[ahr-kuhs]

ar·cus

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


Origin:
< Latin: bow, arch
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Arcus is always a great word to know.
So is warning. Does it mean:
an announcement to the public that a storm or other weather hazard is imminent and that immediate steps should be taken to protect lives and property
atmospheric conditions having or characterized by zero visibility in both horizontal and vertical directions
American Heritage
Medical Dictionary

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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