n. & v.
n. 1 part of the circumference of a circle or any other curve. 2 Electr. a luminous discharge between two electrodes.
v.intr. (arced; arcing) form an arc. arc lamp (or light) a light source using an electric arc. arc welding a method of using an electric arc to melt metals to be welded.
[ ME f. OF f. L arcus bow, curve ]