A bronchus or a primary branch off of one.
More example sentences
- The web-like structures of her dyed fibres and rice paper prints reflect tree branches, bronchial tubes and the circulatory system.
- At the base, a bird's trachea splits into two branches, the bronchial tubes.
- When we breathe, air travels into the lungs through a series of bronchial tubes, which branch out like a tree, gradually getting smaller, until they turn into millions of tiny air bags called alveoli.