The Collaborative International Dictionary of English v.0.48:
Bronchial \Bron"chi*al\, a. [Cf. F. bronchial. See Bronchia.]
Belonging to the bronchi and their ramifications in the
Bronchial arteries, branches of the descending aorta,
accompanying the bronchia in all their ramifications.
Bronchial cells, the air cells terminating the bronchia.
Bronchial glands, glands whose functions are unknown,
seated along the bronchia.
Bronchial membrane, the mucous membrane lining the
Bronchial tube, the bronchi, or the bronchia.