Counterguard
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Coun´ter`guard`
(koun´tẽr`gärd`)n. | 1. | (Fort.) A low outwork before a bastion or ravelin, consisting of two lines of rampart parallel to the faces of the bastion, and protecting them from a breaching fire. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.