iron clad

ironclad

[adj. ahy-ern-klad; n. ahy-ern-klad]
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:
1850–55; iron + clad1

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World English Dictionary
ironclad
 
adj
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
 
n
4.  a large wooden 19th-century warship with armoured plating

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

ironclad
(adj.) of warships, 1852, Amer.Eng., from iron + clad. As a noun meaning "iron-clad ship," it is attested from 1862). Of contracts, etc., 1884.
Online Etymology Dictionary, © 2010 Douglas Harper
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