Ironclad meaning

īərn-klăd
Frequency:
Sheathed with iron plates for protection.
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Rigid; fixed.

An ironclad rule.

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A 19th-century warship having sides armored with metal plates.
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Covered or protected with iron.
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Difficult to change or break.

An ironclad lease.

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Covered with iron, steel, or some metal, armor-plated.

1903, The Land Ironclads, edition Digitized, Science Fiction, Project Gutenberg, published 2006:In that flickering pallor it had the effect of a large and clumsy black insect, an insect the size of an ironclad cruiser, crawling obliquely to the first line of trenches and firing shots out of portholes in its side.

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(figuratively) Solid 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.

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(figuratively) Rigorous; severe; exacting.

An ironclad oath or pledge.

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A metal-plated ship, vessel, or vehicle.

1903, The Land Ironclads, edition Digitized, Science Fiction, Project Gutenberg, published 2006:He turned again to the nearest land ironclad, advancing now obliquely to him and not three hundred yards away, and then scrambled the ground over which he must retreat if he was not to be captured.

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(military) An armor-plated warship.
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A warship of the 19th cent. armored with thick iron plates.
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Other Word Forms

Noun

Singular:
ironclad
Plural:
ironclads

Origin of ironclad