BILOXI • DICTIONARY ONE.COM • Definition of Biloxi

... allied to that of the western Dakota, it bears evidence of being older in form,"(5) and consequently that the Siouan tribes of the interior seem to have migrated westward from a common fatherland with their eastern brethren bordering the Atlantic. Subsequently Gatschet discovered that the Biloxi Indians of the Gulf coast used many terms common to the Siouan tongues; and in 1891 Dorsey visited these Indians and procured a rich collection of words, phrases, and myths, whereby the Siouan affinity of these Indians was established. ...

— The Siouan Indians • W. J. McGee