n :  any of various nematodes esp. of the family Metastrongylidae that infest the lungs and air passages of mammals: as  a  :  a nematode of the genus Dictyocaulus  b  :  a lungworm of the genus Metastrongylus(M. elongatus) that infests swine, causes bronchitis, and serves as an intermediate host of the swine-influenza virus .
 
 
 
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