Definition of strongroom noun from the Oxford Advanced Learner's Dictionary

 

strongroom

 noun
noun
BrE BrE//ˈstrɒŋruːm//
 
; NAmE NAmE//ˈstrɔːŋruːm//
 
; BrE BrE//ˈstrɒŋrʊm//
 
; NAmE NAmE//ˈstrɔːŋrʊm//
 
 
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a room, for example in a bank, with thick walls and a strong solid door, where valuable items are kept
See the Oxford Advanced American Dictionary entry: strongroom