Ironclad Definition

īərn-klăd
ironclads
adjective
Covered or protected with iron.
Webster's New World
Rigid; fixed.
An ironclad rule.
American Heritage
Difficult to change or break.
An ironclad lease.
Webster's New World

(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.
Wiktionary
(figuratively) Rigorous; severe; exacting.
An ironclad oath or pledge.
Wiktionary
noun
ironclads
A warship of the 19th cent. armored with thick iron plates.
Webster's New World

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.
Wiktionary

(military) An armor-plated warship.

Wiktionary

Other Word Forms of Ironclad

Noun

Singular:
ironclad
Plural:
ironclads

Origin of Ironclad

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