agger

/ˈædʒər/
noun
  1. A mound, bank, or rampart of earth, especially one built for defense or as a road foundation in ancient Roman construction.
    • The Roman soldiers built an agger to protect their camp from enemy attacks.
    • Archaeologists uncovered the remains of an ancient agger that once supported a major road.
    • The park still shows the outline of the old agger that surrounded the fort.
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