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Meaning of ironclad

i•ron•clad

Pronunciation: (adj.ī'urn-klad'n.ī'urn-klad&sec), [key]
— adj.
  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.
—n.
  1. a wooden warship of the middle or late 19th century having iron or steel armor plating.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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