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roll cloud

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ar⋅cus

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

Origin:
< L: bow, arch

rotor cloud

 
–noun
a cloud within and around which the air is rotating about a horizontal axis, occurring in the lee of a large mountain barrier.
Also called roll cloud.

Origin:
1955–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: ar·cus
Pronunciation: 'är-k&s
Function: noun
Inflected Form: plural arcus
: an anatomical arch
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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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