Mounds of earth which the Romans raised in front of positions that they were attacking to give commanding locations for their projectile engines. They were also used as a shelter for the troops forming for an attack.

Ag"ger (#), n. [L., a mound, fr. aggerere to bear to a place, heap up; ad + gerere to bear.]

An earthwork; a mound; a raised work.

Hearne.

© Webster 1913.