countermure


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countermure

(ˈkaʊntəˌmjʊə)
n
a wall positioned behind, or before, another wall and hence providing extra defencea wall raised by besiegers in order to aid the siege
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014