[1] : The Collaborative International Dictionary of English v.0.48

arc \arc\ aumrk, v. i. imp.  p. p. arcked aumrkt; p.
   pr.  vb. n. arcking. elec.
   to form a voltaic arc, as an electrical current in a broken
   or disconnected circuit.
   webster 1913 suppl.
see also:
arcked arcking 

[2] : The Collaborative International Dictionary of English v.0.48

arc \arc\, n. f. arc, l. arcus bow, arc. see arch, n.
   1. geom. a portion of a curved line; as, the arc of a
      circle or of an ellipse.
      1913 webster

   2. a curvature in the shape of a circular arc or an arch; as,
      the colored arc the rainbow; the arc of hadley's
      quadrant.
      1913 webster

   3. an arch. obs.
      1913 webster

            statues and trophies, and triumphal arcs. --milton.
      1913 webster

   4. the apparent arc described, above or below the horizon, by
      the sun or other celestial body. the diurnal arc is
      described during the daytime, the nocturnal arc during the
      night.
      1913 webster

   electric arc, voltaic arc. see under voltaic.
      1913 webster
see also:
arch electric arc voltaic arc voltaic 

[3] : WordNet (r) 2.0

arc
     n 1: electrical conduction through a gas in an applied electric
          field syn: discharge, spark, electric arc, electric
          discharge
     2: a continuous portion of a circle
     3: something curved in shape syn: bow
     v : form an arch or curve; "her back arches"; "her hips curve
         nicely" syn: arch, curve
     also: arcking, arcked
see also:
discharge spark electric arc electric discharge bow arch 
curve arcking arcked 

[4] : Moby Thesaurus II by Grady Ward, 1.0

59 moby thesaurus words for "arc":
   ac arc, poulsen arc, aperiodic discharge, arc column,
   arc discharge, arc light, arch, bend, bow, brush discharge,
   catacaustic, catenary, caustic, circle, color filter, conchoid,
   crook, curl, curvation, curvature, curve, diacaustic, dimmer,
   discharge, disruptive discharge, electric discharge,
   electric shock, electric spark, electrodeless discharge, ellipse,
   festoon, floats, flood, floodlight, footlights, foots,
   galvanic shock, gelatin, glow discharge, hook, hyperbola,
   klieg light, light plot, lights, limelight, lituus, marquee,
   medium, oscillatory discharge, parabola, round, shock,
   silent discharge, sinus, spark, spark gap, spot, spotlight,
   tracery

[5] : Virtual Entity of Relevant Acronyms (Version 1.9, June 2002)

arc
     advanced risc computing architecture ace, risc
     
     

[6] : The Free On-line Dictionary of Computing (27 SEP 03)

arc
     
        1.  an old archive format for ibm pc.
        the format is now so obscure that it is only likely to be
        supported by jack-of-all-trades decompression programs such as
        winzip.
     
        2.  an edge in a tree.  "branch" is a
        generally more common synonym.
     
        1998-12-29
     
     
see also:
archive ibm pc winzip edge tree branch 

[7] : The Free On-line Dictionary of Computing (27 SEP 03)

arc
     
        advanced risc computing specification
     
     
see also:
advanced risc computing specification 

Arc >> A Words
Arc, definition of term: Arc
arc_pag1.html

Arc Light >> A Words
Arc Light, definition of term: Arc Light
arc+light_pag1.html