definition of
arc

[1] #1 arc n. [discharge, spark, electric arc, electric discharge] electrical conduction through a gas in an applied electric field. wn

[2] #2 arc n. a continuous portion of a circle. wn

[3] #3 arc v. [arch, curve] form an arch or curve; "her back arches"; "her hips curve nicely". wn

[4] #4 arc n. [bow] something curved in shape. wn