n. [ Counter- + mure: cf. F. contremur. ] (Fort.) A wall raised behind another, to supply its place when breached or destroyed. [ R. ] Cf. Contramure. Knolles. [ 1913 Webster ]

v. t. [ imp. & p. p. Countermured p. pr. & vb. n. Countermuring. ] [ Cf. F. contremurer. ] To fortify with a wall behind another wall. [ R. ] Kyd. [ 1913 Webster ]