Agger

n. mound or rampart in ancient Rome; type of high tide in which the water rises recedes and rises again; type of low tide in which the water recedes rises and recedes again

For the river in Germany see Agger River. For the Danish footballer see Daniel Agger Agger is the Roman word for an embankment or rampart, from the Latin aggero meaning to heap up, make a mound.It is especially used for the raised and cambered embankment carrying a Roman road. The agger was constructed by excavating the line of the road, building a firm foundation, refilling and compressing the soil, adding more soil from digging drainage ditches (fossa) on one or both sides of the road, then surfacing with graded layers of stone and cobbles. The course of a Roman road can often be traced today by the distinctive line of the agger across the landscape.
See more at Wikipedia.org...

(n.)
An earthwork; a mound; a raised work.
  

N M
rampart (or material for); causeway| pier; heap| pile| mound; dam; mud wall