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The Collaborative International Dictionary
Vauntmure

Vauntmure \Vaunt"mure`\, n. [F. avant-mur. See Vanguard, and Mure.] (Fort.) A false wall; a work raised in front of the main wall. [Written also vaimure, and vamure.]
--Camden.

Wiktionary
vauntmure

n. A false wall raised in front of the main wall as a fortification.