1. 1. A Native American confederacy composed of numerous small tribes formerly inhabiting the Red River area of Louisiana, Arkansas, and eastern Texas and now located in central Oklahoma.
   2. A member of this confederacy.
2. The Caddoan language of the Caddo.

[French, from Caddo kaduhdā·čuq, a major tribe of the Caddo confederacy.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.