bronchiole
noun
bron·chi·ole ˈbräŋ-kē-ˌōl 
: a minute thin-walled branch of a bronchus
bronchiolar
ˌbräŋ-kē-ˈō-lər
adjective 
Example Sentences
Recent Examples on the Web Popcorn lung, or bronchiolitis obliterans, is an inflammatory condition that affects the bronchioles, tiny airways in the lungs. 
Jacqueline Howard, CNN, 22 Nov. 2019
Jacqueline Howard, CNN, 22 Nov. 2019 Word History
Etymology
borrowed from New Latin bronchiolum, diminutive of Late Latin bronchium "branch of a bronchus, bronchial tube" — more at bronchial
First Known Use
circa 1860, in the meaning defined above
Medical Definition
bronchiole
noun
bron·chi·ole ˈbräŋ-kē-ˌōl
: a minute thin-walled branch of a bronchus