Source : Webster's Revised Unabridged Dictionary (1913)

Winnebagoes \Win`ne*ba"goes\, n.; sing. {Winnebago}. (Ethnol.)
   A tribe of North American Indians who originally occupied the
   region about Green Bay, Lake Michigan, but were driven back
   from the lake and nearly exterminated in 1640 by the
   IIlinnois.

Source : WordNet®

Winnebago
     n 1: a member of the Siouan-speaking people formerly living in
          eastern Wisconsin south of Green Bay; ally of the
          Menomini and enemy of the Fox and Sauk people
     2: the Siouan language spoken by the Winnebago people