arcus
[ahr-kuh s]
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noun, plural ar·cus. Meteorology.
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. 2019
Examples from the Web for arcus
Historical Examples of arcus
A view of this is given by Donati, who calls it the Arcus Domitiani.
Old RomeRobert Burn
Moreover, there is the arcus senilis, the fine translucent to opaque circle surrounding the outer portion of the iris.
Arteriosclerosis and Hypertension:Louis Marshall Warfield
The Romans originally called their triumphal arch fornix, not arcus.
Rambles in RomeS. Russell Forbes
Otia si tollas, periere Cupidinis arcus—Remove 45 the temptations of idleness, and Cupid's bow is useless.
The frustules are curved or arcuate (arcus, a bow) in the side view, oblong and narrowed at the ends in the front view.
An Elementary Text-book of the MicroscopeJohn William Griffith
arcus
[är′kəs]
n. pl. arcus
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.