A heavy ironclad door.
ironclad definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- covered or protected with iron
- difficult to change or break: an ironclad lease
a warship of the 19th cent. armored with thick iron plates
ironclad definition by American Heritage Dictionary
- Sheathed with iron plates for protection.
- Rigid; fixed: an ironclad rule.
A 19th-century warship having sides armored with metal plates.