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

dancer \dan"cer\, n.
   one who dances or who practices dancing.
   1913 webster

   the merry dancers, beams of the northern lights when they
      rise and fall alternately without any considerable change
      of length. see aurora borealis, under aurora.
      1913 webster
see also:
the merry dancers aurora borealis aurora 

[2] : WordNet (r) 2.0

dancer
     n 1: a performer who dances syn: professional dancer
     2: a person who participates in a social gathering arranged for
        dancing as a ball syn: social dancer
see also:
professional dancer social dancer 

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

52 moby thesaurus words for "dancer":
   artist, artiste, ballerina, ballet dancer, ballet girl,
   ballroom dancer, belly dancer, burlesque queen, choral dancer,
   chorine, chorus boy, chorus girl, clog dancer, conjurer, coryphee,
   dancing girl, danseur, danseur noble, danseuse, ecdysiast,
   entertainer, exotic dancer, female impersonator, figurant,
   figurante, geisha, geisha girl, guisard, guiser,
   heel-and-toe dancer, hoofer, hula girl, impersonator, magician,
   mountebank, mummer, musician, nautch girl, peeler, performer,
   prestidigitator, prima ballerina, public entertainer, show girl,
   singer, square-dancer, stripper, stripteaser, stripteuse,
   terpsichorean, vaudevillian, vaudevillist

Dancer >> D Words
Dancer, definition of term: Dancer
dancer_pag1.html

Taxi Dancer >> T Words
Taxi Dancer, definition of term: Taxi Dancer
taxi+dancer_pag1.html

Gandy Dancer >> G Words
Gandy Dancer, definition of term: Gandy Dancer
gandy+dancer_pag1.html

Ballet Dancer >> B Words
Ballet Dancer, definition of term: Ballet Dancer
ballet+dancer_pag1.html

Belly Dancer >> B Words
Belly Dancer, definition of term: Belly Dancer
belly+dancer_pag1.html