Dictionary.com
Thesaurus.com
Showing results for arcus. Search instead for arculi.

arcus

American  
[ahr-kuhs] / ˈɑr kəs /

noun

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


Other Word Forms

Noun Inflected Forms

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.

See Examples For:

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

Practically every one with a well-marked arcus senilis has arteriosclerosis, but vice versa not every one with even marked arteriosclerosis has an arcus senilis.

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

Its claim, as the parent of projectile implements, is recognized in the common etymology of arcus, arcualia—artillery.

From Lippincott's Magazine of Popular Literature and Science Volume 15, No. 85, January, 1875 by Various

Vocabulary.com logo
by dictionary.com

Dictionary.com's Learning Companion

Go beyond just looking up words.
Remember them forever with VocabTrainer.

Start training