The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
bronchus n 1: either of the two main branches of the trachea [syn: bronchus, bronchial tube]