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arcus

American  
[ahr-kuhs] / ˈɑr kəs /

noun

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


Etymology

Origin of arcus

< Latin: bow, arch

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

One evening, ominous, low-lying tube-shaped clouds known as arcus formed, and whitecaps appeared in the waves.

From The Wall Street Journal • Nov. 30, 2025

Video shows a shelf cloud - a type of arcus cloud - form before a thunderstorm hit Portland.

From BBC • Sep. 13, 2022

To Cassiopeia, she added, “Next time, try pluvius arcus, dear; the meaning is clearer.”

From "The Incorrigible Children of Ashton Place: Book I: The Mysterious Howling" by Maryrose Wood

Moreover, there is the arcus senilis, the fine translucent to opaque circle surrounding the outer portion of the iris.

From Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. by Warfield, Louis Marshall

O bene, quod pharetra hoc saltem tua praestat et arcus, Ne tibi in extremos sit pyra nulla rogos!

From The Complete Works of Richard Crashaw, Volume II (of 2) by Crashaw, Richard

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