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Adjective: ironclad  'I(-u)rn,klad
  1. Sheathed in iron plates for protection
     
  2. Inflexibly entrenched and unchangeable
    "an ironclad rule";
    - brassbound
Noun: ironclad  'I(-u)rn,klad
  1. A wooden warship of the 19th century that is plated with iron or steel armour

Derived forms: ironclads

See also: inflexible, sheathed

Type of: combat ship, war vessel, warship

Encyclopedia: Ironclad