Pronunciation: (yangk"tu-nī'), [key]
—pl. -nais, (esp. collectively) -nai.
a member of one of two tribes of Dakota Indian people who inhabited the northern Great Plains in the 18th and 19th centuries. Cf. Yankton (def. 1).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.