Source : Webster's Revised Unabridged Dictionary (1913)

Bronchus \Bron"chus\, n.; pl. {Bronchi}. [NL., fr. Gr. ?
   windpipe. Cf. {Bronchia}.] (Anat.)
   One of the subdivisions of the trachea or windpipe; esp. one
   of the two primary divisions.

Source : WordNet®

bronchus
     n : either of the two main branches of the trachea [syn: {bronchial
         tube}]
     [also: {bronchi} (pl)]