[ ahr-kuh s ]
/ ˈɑr kəs /

noun, plural ar·cus. Meteorology.

a dense, horizontal, roll-shaped cloud sometimes occurring at the lower front portion of a cumulonimbus.

Nearby words

  1. arcuate ligament,
  2. arcuate nuclei,
  3. arcuate veins of kidney,
  4. arcuate zone,
  5. arcuation,
  6. arcus cornealis,
  7. arcus senilis,
  8. ard,
  9. ardeb,
  10. ardebil

Origin of arcus

< Latin: bow, arch

Also called roll cloud. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for arcus

Medicine definitions for arcus


[ ärkəs ]

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.