Geometry. any unbroken part of the circumference of a circle or other curved line.
Also called electric arc. Electricity. a luminous bridge formed in a gap between two electrodes. Compare spark1 ( def 2 ).
Astronomy. the part of a circle representing the apparent course of a heavenly body.
anything bow-shaped.
verb (used without object), arced [ahrkt] or arcked, arcing [ahr-king] or arcking.
to form an electric arc.
to move in a curve suggestive of an arc.

1350–1400; Middle English ark < Latin arcus bow, arch, curve

arc, ark. Unabridged




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

Arc, d'

Jeanne [zhahn] , Joan of Arc. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
arc (ɑːk)
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.  astronomy a circular section of the apparent path of a celestial body
5.  maths a section of a curve, graph, or geometric figure
vb , arcs, arcing, arced, arcs, arcking, arcked
6.  (intr) to form an arc
7.  maths specifying an inverse trigonometric function: usually written arcsin, arctan, arcsec, etc, or sometimes sin--1, tan--1, sec--1, etc
[C14: from Old French, from Latin arcus bow, arch]

abbreviation for
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. arc, from L. arcus "a bow, arch," from PIE base *arqu- "bowed, curved" (cf. Goth. arhvazna "arrow," O.E. earh, O.N. ör). Electrical sense is from 1821.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

arc (ärk)
A curved line or segment of a circle.

ARC abbr.
AIDS-related complex

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
arc   (ärk)  Pronunciation Key 
  1. A segment of a circle.

  2. See electric arc.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

ARC definition

Advanced RISC Computing Specification

arc definition

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.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Abbreviations & Acronyms
  1. Addiction Research Center

  2. advance readers copy

  3. AIDS-related complex

  4. amateur radio club

  5. American Red Cross

  6. [National Aeronautics and Space Administration] Ames Research Center

  7. Appalachian Regional Commission

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
In one important way, however, my particular arc does suggest some advice.
What some pilot plants have shown so far, however, is that a lot of the
  electricity produced is needed to power the arc.
But when lines are strong enough to arc out, wildly conductive plasma follows.
Arc levels are normally low in a cell but increase considerably when neuronal
  activity has taken place.
Image for arc
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