Definition of arc noun from the Oxford Advanced Learner's Dictionary

     

    arc

     noun
    noun
    BrE BrE//ɑːk//
     
    ; NAmE NAmE//ɑːrk//
     
     
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  1. 1 (geometry) part of a circle or a curved line to draw an arc using a compass
  2. 2a curved shape the arc of a rainbow The beach swept around in an arc.
  3. 3 (specialist) an electric current passing across a space between two terminals see also arc lamp
  4. Word Origin late Middle English (denoting the path of a celestial object, especially the sun, from horizon to horizon): via Old French from Latin arcus ‘bow, curve’.Extra examples firing shells in a high arc over our heads forming a perfect arc in the sky Set the point of the compasses at one end of the line and draw an arc. The arc of the rainbow reached out across the valley.
See the Oxford Advanced American Dictionary entry: arc

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