bronchiole🔊nounUK /ˈbɹɒŋ.kiˌəʊl/ · US /ˈbɹɑŋ.kiˌoʊl/Etymology From bronchial + -ole.1Anatomy, Medicine, Sciences Any of the small cartilage-less branches of a bronchus.Derived termsbronchiolar, bronchiolectasis, bronchiolitis, bronchiolization, bronchioloalveolar, peribronchiole, respiratory bronchiole, terminal bronchiole