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  Dictionary Definition of arc

arc
noun
1. any part of a circle or other curved line.
2. Electricity the luminous bridge formed by the passage of a current across a gap between two conductors or terminals, due to the incandescence of the conducting gas.
3. Astronomy the part of a circle representing the apparent course of a heavenly body.
4. anything bow-shaped.
-- verb (i) ( arced , arcing )
5. to form an electric arc.
-- phrase
6. strike an arc, in electric welding, to apply a rod to the material to be welded, thereby causing an arc (def. 2).
[ME ark, from L arcus bow]
Arc
noun Jeanne d' . See Joan of Arc1.
ARC
AIDS-related complex.