(n)a member of the large western branch of Sioux people which was made up of several groups that lived on the plains, Syn.Teton Sioux, Teton Dakota, Lakota
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
(Geol.) A subdivision at the base of the cretaceous formation in Western North America; -- so named from the region where the strata were first studied. [ 1913 Webster ]
n. pl.; sing. Dacota /sing>. (Ethnol.) An extensive race or stock of Indians, including many tribes, mostly dwelling west of the Mississippi River; -- also, in part, called Sioux. [ Written also Dacotahs. ] [ 1913 Webster ]