NOUN (2)

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;

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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