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Synonyms
arc (ärk)

[Middle English ark, from Old French arc, from Latin arcus.]

noun 

  1. Something shaped like a curve or arch: the vivid arc of a rainbow.
  2. Mathematics A segment of a circle.
  3. An electric arc.
  4. Astronomy The apparent path of a celestial body as it rises above and falls below the horizon.

intransitive verb: arced (ärkt), arc·ing (äŕkĭng), arcs. 

  1. To form an arc.
  2. To move or seem to move in a curved path: the stars that arc across the sky.
ARC1 (ärk)

[A(IDS)-r(elated) c(omplex).]

noun 

A combination of symptoms, including fever, lymphadenopathy, blood abnormalities, and susceptibility to opportunistic infections that is a precursor to AIDS in some individuals infected with HIV.
ARC2

abbreviation 

American Red Cross