Definition of bronchus noun from the Oxford Advanced American Dictionary

 

bronchus

 noun
noun
NAmE//ˈbrɑŋkəs//
 
(pl. bronchi
NAmE//ˈbrɑŋkaɪ//
 
, NAmE//ˈbrɑŋki//
 
)
(anatomy)
 
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any one of the system of tubes which make up the main branches of the windpipe through which air passes in and out of the lungs
See the Oxford Advanced Learner's Dictionary entry: bronchus