Source : Webster's Revised Unabridged Dictionary (1913)

Spleenwort \Spleen"wort`\, n. [Spleen + wort; cf. L. splenium,
   asplenium, Gr. ????, ????, ???. ] (Bot.)
   Any fern of the genus {Asplenium}, some species of which were
   anciently used as remedies for disorders of the spleen.

Source : WordNet®

spleenwort
     n : any of various chiefly rock-inhabiting ferns of the genus
         Asplenium