Arcus



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

The Romans originally called their triumphal arch fornix, not arcus.
Rambles in Rome S. Russell Forbes

A view of this is given by Donati, who calls it the arcus Domitiani.
Old Rome Robert Burn

In elderly persons we ought always to look for the arcus senilis, which is a sign of a tendency to fatty degeneration.
A System of Practical Medicine by American Authors, Vol. I Various

Moreover, there is the arcus senilis, the fine translucent to opaque circle surrounding the outer portion of the iris.
Arteriosclerosis and Hypertension: Louis Marshall Warfield

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

Otia si tollas, periere Cupidinis arcus—Remove 45 the temptations of idleness, and Cupid’s bow is useless.
Dictionary of Quotations from Ancient and Modern, English and Foreign Sources James Wood

The etymology of arcus is the same; the root arc not only means to hurl, but to sing or resound.
Myth and Science Tito Vignoli

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 ar·cus (är’kəs)
n. pl. arcus
A structure resembling a bent bow or an arch.

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    the appearance of a yellowish-gray lipid ring around the margin of the cornea, occurring in aging persons. Historical Examples In elderly persons we ought always to look for the arcus senilis, which is a sign of a tendency to fatty degeneration. A System of Practical Medicine by American Authors, Vol. I Various Moreover, there is […]



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