'Ironclad' definitions:

Definition of 'ironclad'

(from WordNet)
adjective
Sheathed in iron plates for protection
adjective
Inflexibly entrenched and unchangeable; "brassbound traditions"; "brassbound party loyalists"; "an ironclad rule" [syn: ironclad, brassbound]
noun
A wooden warship of the 19th century that is plated with iron or steel armor

Definition of 'Ironclad'

From: GCIDE
  • Ironclad \I"ron*clad`\, a.
  • 1. having an outer covering of iron or steel; as, an ironclad war vessel. [PJC]
  • 2. so strong or secure as to be unbreakable; as, an ironclad contract. [PJC] irone

Definition of 'Ironclad'

From: GCIDE
  • Ironclad \I"ron*clad`\, a.
  • 1. Clad in iron; protected or covered with iron, as a vessel for naval warfare. [1913 Webster]
  • 2. Rigorous; unbreakable; severe; exacting; inflexible; as, an ironclad oath or pledge. [Colloq.] [1913 Webster]

Definition of 'Ironclad'

From: GCIDE
  • Ironclad \I"ron*clad`\, n. A naval vessel having the parts above water covered and protected by iron or steel usually in large plates closely joined and made sufficiently thick and strong to resist heavy shot. Modern naval vessels are made of steel throughout, and this term is only used in historical contexts. [1913 Webster +PJC]