GNU Collaborative International Dictionary of English

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Found 2 definitions

1.       
   Arc (), 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”.
   
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   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.”
   
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   3. An arch. [Obs.]
   
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   Statues and trophies, and triumphal arcs. Milton.
   
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   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.
   
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   Electric arc, Voltaic arc.  See under Voltaic.
   
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2.       
   Arc (ärk), v. i.  [imp. & p. p. Arcked (ärkt); p. pr. & vb. n. Arcking.] (Elec.) To form a voltaic arc, as an electrical current in a broken or disconnected circuit.
   
   [Webster 1913 Suppl.]