Definitions for caddoanˈkæd oʊ ən
Random House Webster's College Dictionary
Cad•do•anˈkæd oʊ ən(n.)
a family of American Indian languages, including Arikara, Pawnee, and Caddo, spoken or formerly spoken in the Great Plains and adjacent areas of Arkansas and Louisiana.
Caddo, Caddoan, Caddoan language(noun)
a family of North American Indian languages spoken widely in the Midwest by the Caddo
Pertaining to the Caddo.