- covered or cased with iron plates, as a ship for naval warfare; armor-plated.
- very rigid or exacting; inflexible; unbreakable: an ironclad contract.
- a wooden warship of the middle or late 19th century having iron or steel armor plating.
- covered or protected with iron
- inflexible; rigid
- not able to be assailed or contradicted
- a large wooden 19th-century warship with armoured plating
