Countermure \Coun`ter*mure"\ (koun`t?r-m?r"), v. t. [imp. & p. p. {Countermured} (-m?rd"); p. pr. & vb. n. {Countermuring}.] [Cf. F. contremurer.] To fortify with a wall behind another wall. [R.] --Kyd. [1913 Webster]