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

 

bistro

 noun
noun
BrE BrE//ˈbiːstrəʊ//
 
; NAmE NAmE//ˈbiːstroʊ//
 
(pl. bistros) Types of restaurant
 
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a small informal restaurant See related entries: Types of restaurant Word Origin 1920s: French; perhaps related to bistouille, a northern colloquial term meaning ‘bad alcohol’, perhaps from Russian bystro ‘rapidly’.
See the Oxford Advanced American Dictionary entry: bistro