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ironclad

[adj. ahy-ern-klad; n. ahy-ern-klad] /adj. ˈaɪ ərnˈklæd; n. ˈaɪ ərnˌklæd/
adjective
1.
covered or cased with iron plates, as a ship for naval warfare; armor-plated.
2.
very rigid or exacting; inflexible; unbreakable:
an ironclad contract.
noun
3.
a wooden warship of the middle or late 19th century having iron or steel armor plating.
Origin of ironclad
1850-1855
1850-55; iron + clad1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ironclad

ironclad

adjective (ˌaɪənˈklæd)
1.
covered or protected with iron: an ironclad warship
2.
inflexible; rigid: an ironclad rule
3.
not able to be assailed or contradicted: an ironclad argument
noun (ˈaɪənˌklæd)
4.
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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Word Origin and History for ironclad
adj.

1852, of warships, American English, from iron (n.) + clad. Of contracts, etc., 1884. As a noun meaning "iron-clad ship," it is attested from 1862.

Online Etymology Dictionary, © 2010 Douglas Harper
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