Longman Dictionary of Contemporary English homepage

ironclad

 adjective
     
i‧ron‧clad
1 an ironclad agreement, proof, defence etc is so strong and sure that it cannot be changed or argued against:
an ironclad guarantee
2 old-fashioned covered with iron:
an ironclad battleship
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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