Lungworm \Lung"worm`\, n. (Zool.)
Any one of several species of parasitic nematoid worms which
infest the lungs and air passages of cattle, sheep, and other
animals, often proving fatal. The lungworm of cattle
({Strongylus micrurus}) and that of sheep ({Strongylus
filaria}) are the best known.
[1913 Webster]