Mound Builder

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various distinct Native American cultures flourishing from around the 5th century BC to the 16th century AD especially in the Ohio and Mississippi Valleys, practicing settled agriculture and known for their often large burial, temple, or effigy mounds.
• noun A member of a people associated with any of these cultures.

from The Century Dictionary.

• noun One of a race of people by whom the various earthworks called Indian mounds (see mound) were constructed.
• noun A mound-bird.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun prehistoric Amerindians who built altar mounds
• noun large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs