The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A member of any of various Native American peoples flourishing from around the 5th century B.C. to the 16th century A.D. especially in the Ohio and Mississippi valleys, practicing settled agriculture and known for their often large burial and effigy mounds.