Ironclad :: Ironclad (a.) Clad in iron; protected or covered with iron, as a vessel for naval warfare..
Ironclad :: Ironclad (a.) Rigorous; severe; exacting; as, an ironclad oath or pledge..
Ironclad :: Ironclad (n.) A naval vessel having the parts above water covered and protected by iron or steel usually in large plates closely joined and made sufficiently thick and strong to resist heavy shot.