\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.