IPA: /ˈbrɒŋ.kɪ.ə.lər/
KK: /brɒŋˈkaɪələr/
Relating to the small air passages in the lungs that branch from the bronchi.
The bronchiolar walls are important for regulating airflow in the lungs.
Bronchiolar → It is formed from "bronchus" (from Greek "bronkhion", meaning windpipe or airway) and "-ole" (a diminutive suffix meaning small). The word "bronchiolar" refers to small air passages in the lungs that branch from the bronchi.
Think of 'bronchus' as the main airway and '-ole' meaning small, so bronchiolar refers to the small airways branching from the main windpipe.