ironclad meaning and definition

IRONCLAD noun

Definition of ironclad (noun)

1. a wooden warship of the 19th century that is plated with iron or steel armor

IRONCLAD adjective

Definition of ironclad (adjective)

1. sheathed in iron plates for protection
2. inflexibly entrenched and unchangeable
   • "brassbound traditions"; "brassbound party loyalists"; "an ironclad rule"
   • synonyms: brassbound