Source : Webster's Revised Unabridged Dictionary (1913)

Ostic \Os"tic\, a. [From North American Indian oshtegwon a
   head.]
   Pertaining to, or applied to, the language of the Tuscaroras,
   Iroquois, Wyandots, Winnebagoes, and a part of the Sioux
   Indians. --Schoolcraft.