arc
I
 /ˈɑɚk/  noun  ,  pl   arcs [  count  ]
  1 : a line or shape that is curved like part of a circle
   He bent the twig into an arc.
   The ball floated in a high arc.
  2 technical : a brightly glowing electric current that flows across an open space between two points (such as two electrodes)
   an electric arc
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II
  verb  , arcs, arced /ˈɑɚkt/, arc·ing /ˈɑɚkıŋ/ [  no obj  ]
  1 : to move or lie in a curving path : to follow an arc-shaped course
   The arrow arced through the air.
   A light arced across the sky.
   The island chain arcs from north to south.
  2 technical : to form an electric arc