arcus

[ ahr-kuhs ]

/ ˈɑr kəs /

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

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The rainy weather could not ________ my elated spirits on my graduation day.

Also called roll cloud.

<Latin: bow, arch

Cum hoc arcus ejus extenditur, et primo sagittam in partem contrariam transmittit, et unum interficit.
The Fair Maid of Perth|Sir Walter Scott
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 Microscope|John William Griffith
Du Cange gives arcus sellae equestris as one of the meanings of circus.
The Latin & Irish Lives of Ciaran|Anonymous
They are called arcus horarum inequalium, as they shew the 'houres inequales.'
Chaucer's Works, Volume 3 (of 7)|Geoffrey Chaucer

Its claim, as the parent of projectile implements, is recognized in the common etymology of arcus, arcualia—artillery.
Lippincott's Magazine of Popular Literature and Science Vol. XV., No. 85. January, 1875.|Various

arcus

[ är′kəs ]

A structure resembling a bent bow or an arch.