The Collaborative International Dictionary of English v.0.48:

Seminoles \Sem"i*noles\, n. pl.; sing. Seminole. (Ethnol.)
   A tribe of Indians who formerly occupied Florida, where some
   of them still remain. They belonged to the Creek
   Confideration.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Seminole
    n 1: a member of the Muskhogean people who moved into Florida in
         the 18th century
    2: the Muskhogean language of the Seminole