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

 

billabong

 noun
noun
BrE BrE//ˈbɪləbɒŋ//
 
; NAmE NAmE//ˈbɪləbɔːŋ//
 
 
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(in Australia) a lake that is formed when a river floods Word Origin mid 19th cent.: from Wiradhuri bilabang ‘channel that is dry except after rain’.