Definition of Ali Baba noun from the Oxford Advanced American Dictionary

 

Ali Baba

 noun
noun
NAmE//ˌɑli ˈbɑbə//
 
, NAmE//ˌæli‑//
 
 
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a character in an old Arabian story who discovers that saying the magic words “Open Sesame!” will open the door of the cave where thieves have hidden gold and jewelry
See the Oxford Advanced Learner's Dictionary entry: Ali Baba