American English

Definition of ironclad adjective from the Oxford Advanced American Dictionary

 

ironclad

 adjective
adjective
NAmE//ˈaɪərnˌklæd//
 
 
jump to other results
so strong that it cannot be challenged or changed an ironclad alibi/contract/excuse/guarantee His memo is ironclad proof he was involved. compare cast-iron (2)
See the Oxford Advanced Learner's Dictionary entry: ironclad