1. Geometry. any unbroken part of the circumference of a circle or other curved line.
2. Also called electric arc. Electricity. a luminous bridge formed in a gap between two electrodes.Compare spark1 (def 2).
3. Astronomy. the part of a circle representing the apparent course of a heavenly body.
4. anything bow-shaped. verb (used without object), arced[ahrkt]/ɑrkt/ or arcked, arcing[ahr-king]/ˈɑr kɪŋ/ or arcking.
5. to form an electric arc.
6. to move i
"backs can be arcing."
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