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ironclad

 - 3 dictionary results

i⋅ron⋅clad

[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 + clad 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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i·ron·clad   (ī'ərn-klād')   
adj.  
  1. Sheathed with iron plates for protection.

  2. Rigid; fixed: an ironclad rule.

n.  A 19th-century warship having sides armored with metal plates.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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, © 2001 Douglas Harper
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