Definitions
1.AdjectiveCovered with iron, steel, or any other tough metal; armor-plated."Unlike the average vehicle, cash delivery vans are ironclad and almost unstoppable."
2.AdjectiveSolid or certain; not able to be disputed or questioned; irrefutable."The suspect had an ironclad alibi for his whereabouts on the night of the crime."
3.AdjectiveRigorous; severe; exacting."an ironclad oath or pledge"
4.AdjectiveStubborn; inflexible.
5.NounA ship, vessel, or vehicle with a covering of iron, steel, or any other tough metal.
6.NounAn armor-plated warship, one preceding the invention of harveyized steel.
7.NounA wooden warehouse with an outer skin of corrugated metal.