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The Collaborative International Dictionary of English v.0.48 (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]


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]


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