• (n.) A false wall; a work raised in front of the main wall.
Vaunt'mure` noun [ French 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. 
In fortifications a vauntmure is a false wall raised in front of the main wall.