From Longman Dictionary of Contemporary Englishstrongroomstrong‧room /ˈstrɒŋruːm, -rʊm $ ˈstrɒːŋ-/ noun [countable] BFa special room in a bank, shop etc where valuable objects can be kept safely
Examples from the Corpus
strongroom• In 1976, thirty-six boxes were returned and are now kept in a strongroom in the archbishop's palace at Padua.• You need to open up a locked strongroom, and to do this you must retrieve some 5 keys.• The robbers then used computer key-codes to open the strongroom, and packed the 200 million francs into bags.• The robbers opened the strongroom and packed the cash into bags.From Longman Business Dictionarystrongroomstrong‧room /ˈstrɒŋrʊm, -ruːmˈstrɒːŋ-/ noun [countable]BANKING a special room in a bank, shop etc where valuable objects can be kept safelyThe property deeds are usually kept with a bank or in a solicitor’s strongroom. 