ironclad

(-klad′)

adjective

  1. covered or protected with iron
  2. difficult to change or break: an ironclad lease

noun

a warship of the 19th cent. armored with thick iron plates

See ironclad in American Heritage Dictionary 4

adjective
  1. Sheathed with iron plates for protection.
  2. Rigid; fixed: an ironclad rule.
noun
A 19th-century warship having sides armored with metal plates.

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ironclad

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