Definition of the Moundbuilders noun from the Oxford Advanced Learner's Dictionary

 

the Moundbuilders

 noun
noun
BrE
 
; NAmE
 
[plural]
 
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early Native American groups who built mounds (= raised masses of earth). These were used for graves and as the bases for religious temples and other important buildings. Well-known mounds that survive include those at Moundville, Alabama, and the Serpent Mound in Adams County, Ohio.