Webster
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Webster’s Revised Unabridged Dictionary · 1913

Arc

Arc (ärk), n. [F. arc, L. arcus bow, arc. See Arch, n.] 1. (Geom.) A portion of a curved line; as, the arc of a circle or of an ellipse.

2. A curvature in the shape of a circular arc or an arch; as, the colored arc (the rainbow); the arc of Hadley's quadrant.

3. An arch. [Obs.]

Statues and trophies, and triumphal arcs. Milton.

4. The apparent arc described, above or below the horizon, by the sun or other celestial body. The diurnal arc is described during the daytime, the nocturnal arc during the night.

Electric arc, Voltaic arc. See under Voltaic.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.