1. Sheathed in iron plates for protection 
2. Inflexibly entrenched and unchangeable
   "an ironclad rule"
   - brassbound

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

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