Source : Webster's Revised Unabridged Dictionary (1913)

Lungwort \Lung"wort`\, n. (Bot.)
   (a) An herb of the genus {Pulmonaria} ({P. officinalis}), of
       Europe; -- so called because the spotted appearance of
       the leaves resembles that of a diseased lung.
   (b) Any plant of the genus {Mertensia} (esp. {M. Virginica}
       and {M. Sibirica}) plants nearly related to {Pulmonaria}.
       The American lungwort is {Mertensia Virginica}, Virginia
       cowslip. --Gray.

   {Cow's lungwort} mullein.

   {Sea lungwort}, {Mertensia maritima}, found on the seacoast
      of Northern Europe and America.

   {Tree lungwort}, a lichen ({Sticta pulmonacea}) growing on
      trees and rocks. The thallus is lacunose, and in
      appearance somewhat resembles the lungs, for diseases of
      which it was once thought a remedy.

Cow's lungwort \Cow's" lung"wort`\ (kouz" l?ng"w?rt`).
   Mullein.