mound-building1
/ˈmaʊndˌbɪldɪŋ/noun
The action of building mounds.
Origin
Mid 19th century; earliest use found in Herman Melville (1819–1891), novelist and poet. From mound + building.
mound-building2
/ˈmaʊndˌbɪldɪŋ/adjective
Archaeol. Designating the Mound Builders, their culture, territories, etc.
Origin
Mid 19th century (in an earlier sense). From mound + building.