bronchioles Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. any of the smallest bronchial ducts; ending in alveoli Example Sentence Bronchiolitis is the inflammation of the bronchioles. Synonyms duct; epithelial duct; bronchial ducts Antonyms duct tape Hear It! Say It! Write It! bronchioles Switch to cursive Start Share with your friends: