countermure
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Coun·ter·mure n. Fort. A wall raised behind another, to supply its place when breached or destroyed. [R.] Cf. Contramure.
Coun·ter·mure v. t. [imp. & p. p. Countermured p. pr. & vb. n. Countermuring.] To fortify with a wall behind another wall. [R.]
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