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

 

bayou

 noun
noun
BrE BrE//ˈbaɪuː//
 
; NAmE NAmE//ˈbaɪuː//
 
 
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a branch of a river in the southern US that moves very slowly and has many plants growing in it Word Origin mid 18th cent.: from Louisiana French, from Choctaw bayuk.
See the Oxford Advanced American Dictionary entry: bayou