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ironclad

[ adjective ahy-ern-klad; noun ahy-ern-klad ]
/ adjective ˈaɪ ərnˈklæd; noun ˈaɪ ərnˌklæd /
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adjective

covered or cased with iron plates, as a ship for naval warfare; armor-plated.
very rigid or exacting; inflexible; unbreakable: an ironclad contract.

noun

a wooden warship of the middle or late 19th century having iron or steel armor plating.

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Origin of ironclad

First recorded in 1850–55; iron + clad1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for ironclad

ironclad

adjective (ˌaɪənˈklæd)

covered or protected with ironan ironclad warship
inflexible; rigidan ironclad rule
not able to be assailed or contradictedan ironclad argument

noun (ˈaɪənˌklæd)

a large wooden 19th-century warship with armoured plating
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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