bronchi

n. any of the main air passages of the lungs (Anatomy)

A bronchus (plural bronchi, adjective bronchial) is a caliber of airway in the respiratory tract that conducts air into the lungs. No gas exchange takes place in this part of the lungs.
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Bronchi /bron·chi/ plural of bronchus. Bronchi Two main branches of the trachea that go into the lungs. [more]Bronchi - Community and Resources

Noun
1. either of the two main branches of the trachea
(synonym) bronchial tube
(hypernym) cartilaginous tube
(part-holonym) lower respiratory tract

n. bronchus, any of the main air passages of the lungs (Anatomy)