D defs.my
Entry 1 sense Webster, 1913

Contravallation

· Con·tra·val·la·tion · IPA /ˌkɑntɹəvəˈleɪʃən/
01 n. A trench guarded with a parapet, constructed by besiegers, to secure themselves and check sallies of the besieged.
  1. 1.
    A trench guarded with a parapet, constructed by besiegers, to secure themselves and check sallies of the besieged.(Fort.)