Agger

·noun An earthwork; a mound; a raised work.

agger
agger, ĕris, m. [ad-gero]. I Things brought to a place in order to form an elevation above a surfa...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
agger
agger eris, m ad + GES-, a mass, heap, collection, pile : aggere paludem explere, Cs.: longius era...

An Elementary Latin Dictionary