'ARC': [ˌeɪɑːˈsiː]; 'arc': ['ɑːk]

WordReference Random House Learner's Dictionary of American English © 2019
arc /ɑrk/USA pronunciation   n. 
  1. Mathematicsany unbroken part of the circumference of a circle:an arc of twenty degrees.
  2. something curved or arched like a bow.
  3. Electricitythe light formed in a gap between two electrodes when electricity flows through them:the arc of the light bulb.

v. [no object]
  1. Electricityto form an electric arc:The current arced across the electrodes.
  2. to move in a curved line:The ball arced through the air.

ARC or A.R.C., an abbreviation of:
  1. American Red Cross.

WordReference Random House Unabridged Dictionary of American English © 2019
arc  (ärk),USA pronunciation n., v.,  arced (ärk),USA pronunciation or arcked, arc•ing 
    (ärk),USA pronunciation or arck•ing. 
    1. Mathematics[Geom.]any unbroken part of the circumference of a circle or other curved line.
    2. ElectricityAlso called  electric arc. a luminous bridge formed in a gap between two electrodes. Cf. spark1 (def. 2).
    3. Astronomythe part of a circle representing the apparent course of a heavenly body.
    4. anything bow-shaped.

    1. Electricityto form an electric arc.
    2. to move in a curve suggestive of an arc.
    • Latin arcus bow, arch, curve
    • Middle English ark 1350–1400

ARC  (ärk),USA pronunciation 
  • Pathology, n. See  AIDS-related complex. 

  • ARC, 
  • American Red Cross.
  • Also,  A.R.C. 

    Collins Concise English Dictionary © HarperCollins Publishers::

    arc /ɑːk/ n
    1. something curved in shape
    2. part of an unbroken curved line
    3. a luminous discharge that occurs when an electric current flows between two electrodes or any other two surfaces separated by a small gap and a high potential difference
    4. a section of a curve, graph, or geometric figure
    vb (arcs, arcing, arced, arcs, arcking, arcked)
    1. (intransitive) to form an arc
    1. specifying an inverse trigonometric function: usually written arcsin, arctan, arcsec, etc, or sometimes sin–1, tan–1, sec–1, etc
    Etymology: 14th Century: from Old French, from Latin arcus bow, arch

    ARC abbreviation for
    1. AIDS-related complex: an early condition in which a person infected with the AIDS virus may suffer from such mild symptoms as loss of weight, fever, etc

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