The Collaborative International Dictionary of English v.0.48:

Danseuse \Dan`seuse"\, n. [F., fr. danser to dance.]
   A professional female dancer; a woman who dances at a public
   exhibition as in a ballet.
   [1913 Webster]

WordNet (r) 3.0 (2006):

danseuse
    n 1: a female ballet dancer [syn: ballerina, danseuse]