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contravallation    
n. 对垒

对垒

Contravallation \Con`tra*val*la"tion\, n. [Pref. contra-
vallation: cf. F. contrevallation. Cf. {Countervallation}.]
(Fort.)
A trench guarded with a parapet, constructed by besiegers, to
secure themselves and check sallies of the besieged.
[1913 Webster]


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