cannonproof en · ADJ
Etymology
From cannon + -proof.
Meanings
-
(not-comparable) Impenetrable by cannonballs.
It had not helped the duke to build himself a cannonproof stone chamber to sleep in for dread of vengeance after the assassination of Orleans.
1948, Frances Winwar, The Saint and the Devil, page 33:A cannonproof breastwork, built during the previous war, extended along the beach from the hills to the rocks.
1983, Richard J. Hargrove, General John Burgoyne, page 26: