tricolour

from WordNet (r) 3.0 (2006)

tricolour
    n 1: a flag having three colored stripes (especially the French
         flag) [syn: {tricolor}, {tricolour}]

from The Collaborative International Dictionary of English v.0.48

Tricolor \Tri"col`or\, n. [F. tricolore, drapeau tricolore a
   tricolored flag, fr. tricolore three-colored; tri (see
   {Tri-}) + L. color color.] [Written also {tricolour}.]
   [1913 Webster]
   1. The national French banner, of three colors, blue, white,
      and red, adopted at the first revolution.
      [1913 Webster]

   2. Hence, any three-colored flag.
      [1913 Webster]