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Ironclad
Ironclad I"ron*clad`, a.
1. Clad in iron; protected or covered with iron, as a vessel
for naval warfare.
2. Rigorous; severe; exacting; as, an ironclad oath or
pledge. [Colloq.]
Ironclad
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.
Meaning of Ironclad from wikipedia