ironclad
n.a large, powerful ship with a metal armor covering. These ships were used in the past to protect against enemy attacks.
n.a warship protected by a metal plating, typically iron or steel. Historically significant in the transition from wooden sailing vessels to modern naval architecture.
“The ironclad was the most powerful ship in the harbor.”
“During the mid-nineteenth century, the introduction of the ironclad changed the nature of naval warfare forever.”
“The CSS Virginia, originally a steam frigate, was converted into an ironclad to challenge the Union's naval blockade of the southern ports.”
“As I made clear in Kyiv last week, our commitment to supporting Ukraine from Russia’s illegal invasion is ironclad.”
“Five years ago, a seemingly ironclad test of whether something was conscious was to see if you could have a conversation with it.”
From iron + clad.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.