A curved line; any section of a curve.

【数】弧；圆周之一部。

The curved band of light formed between two electrodes caused by the passage of an electric current.

【电】弧光。

Anything bow-shaped.

弧形或弓形之物。

To form an electric arc (said of two electrodes or two adjacent wires, or of the current with which they are charged).

形成弧光。