Source : Webster's Revised Unabridged Dictionary (1913)

Oneidas \O*nei"das\, n. pl.; sing. {Oneida}. (Ethnol.)
   A tribe of Indians formerly inhabiting the region near Oneida
   Lake in the State of New York, and forming part of the Five
   Nations. Remnants of the tribe now live in New York, Canada,
   and Wisconsin.

Source : WordNet®

Oneida
     n 1: a member of the Iroquoian people formerly living east of
          Lake Ontario
     2: the Iroquoian language spoken by the Oneida people