Caddoan
Concise Oxford English Dictionary © 2008 Oxford University Press:
Caddoan /ˈkadəʊən/
▶noun
- 1 a member of a group of American Indian peoples formerly inhabiting the Midwest.
- 2 the family of languages spoken by the Caddoans, which includes Pawnee, now all virtually extinct.
'Caddoan' also found in these Oxford entries:

