ironclad

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a wooden warship of the 19th century that is plated with iron or steel armor
adjective sheathed in iron plates for protection
adjective inflexibly entrenched and unchangeable

From iron + clad.

By then the ironclad was no more than three miles off. — Twenty Thousand Leagues Under the Seas: An Underwater Tour of the World, Jules Verne
But the ironclads to seaward were now quite close and standing in towards shore past the steamboat. — The war of the worlds, H. G. (Herbert George) Wells
120 note[3]; quoted, on Confederate ironclads in England, 130 note[2] France: Naval right of search exercised by, i. — Great Britain and the American Civil War, Ephraim Douglass Adams

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