Noun
An earthwork; a mound; a raised work.
Source: Webster's dictionaryDorsum or agger viae: the elliptical surface or crown of the road (media stratae eminentia) made of polygonal blocks of silex (basaltic lava) or rectangular blocks of saxum qitadratum (travertine, peperino, or other stone of the country). Source: Internet
What Agger is criticising is the awful ‘me too’ dross that fantasy writers produce. Source: Internet
The Romans called a simple rampart wall an agger ; at this date great height was not necessary. Source: Internet