Definition of: arc

(ärk) noun
1. Anything in the shape of an arch, of a curve, or of a part of a circle; a bow; arch.
2. Geom. A part of any algebraic curve, especially of a circle.
3. Electr. The bow of flame occurring in an arc light.
4. Astron. A part of the apparent path of a heavenly body.
—v.i. arcked or arced (ärkt), arck·ing or arc·ing (är′king) Electr. To form a voltaic arc. ♦ Homophone: ark. [<L arcus bow, arch. Doublet of ARCH¹.]