bronchiole
noun/ˈbrɒŋkiəʊl/
/ˈbrɑːŋkiəʊl/
(anatomy)- one of many very small tubes connected to the bronchiWord Originmid 19th cent.: from modern Latin bronchiolus, bronchiolum, diminutives of late Latin bronchia, denoting the branches of the main bronchi.
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bronchiole