The Collaborative International Dictionary
Mound \Mound\, n. [OE. mound, mund, protection, AS. mund protection, hand; akin to OHG. munt, Icel. mund hand, and prob. to L. manus. See Manual.] An artificial hill or elevation of earth; a raised bank; an embarkment thrown up for defense; a bulwark; a rampart; also, a natural elevation appearing as if thrown up artificially; a regular and isolated hill, hillock, or knoll.
To thrid the thickets or to leap the mounds.
--Dryden.
Mound bird. (Zo["o]l.) See moundbird in the vocabulary.
Mound builders (Ethnol.), the tribe, or tribes, of North American aborigines who built, in former times, extensive mounds of earth, esp. in the valleys of the Mississippi and Ohio Rivers. Formerly they were supposed to have preceded the Indians, but later investigations go to show that they were, in general, identical with the tribes that occupied the country when discovered by Europeans.
Mound maker (Zo["o]l.), any one of the megapodes. See also moundbird in the vocabulary.
Shell mound, a mound of refuse shells, collected by aborigines who subsisted largely on shellfish. See Midden, and Kitchen middens.
Wikipedia
The varying cultures collectively called Mound Builders were inhabitants of North America who, during a 5,000-year period, constructed various styles of earthen mounds for religious and ceremonial, burial, and elite residential purposes. These included the Pre-Columbian cultures of the Archaic period; Woodland period ( Adena and Hopewell cultures); and Mississippian period; dating from roughly 3500 BCE (the construction of Watson Brake) to the 16th century CE, and living in regions of the Great Lakes, the Ohio River Valley, and the Mississippi River valley and its tributary waters.
Since the 19th century, the prevailing scholarly consensus has been that the mounds were constructed by indigenous peoples of the Americas. Sixteenth-century Spanish explorers made contact with natives living in a number of later Mississippian cities, described their cultures, and left artifacts. By the time of United States westward expansion two hundred years later, Native Americans were generally not knowledgeable about the civilizations that produced the mounds. Research and study of these cultures and peoples has been based mostly on archaeology and anthropology.
Usage examples of "mound builders".
This may indicate one of two things: either the colonies which settled the Mississippi Valley may have left Atlantis prior to the discovery of the art of manufacturing bronze, by mixing one part of tin with nine parts of copper, or, which is more probable, the manufactures of the Mound Builders may have been made on the spot.
The mound was exactly what a person who did not know the least thing about mound-excavating would expect to find if they investigated a mound inhabited by socalled mound builders.