a small branch of a bronchus. noun any of the smallest bronchial tubes, usually ending in alveoli n. bronchiole (brŏng’kē-ōl’) Any of the small, thin-walled tubes that branch from a bronchus and end in the alveolar sacs of the lung.
noun a condition in which the small airways in the lungs become inflamed by a virus. It is most common in infants, who become breathless in severe cases. Recurrent attacks may lead to asthma bronchiolitis (brŏng’kē-ə-lī’tĭs) An acute viral infection of the bronchioles seen mostly in infants and young children, caused most frequently by the […]