Source : Webster's Revised Unabridged Dictionary (1913)

Thoroughwort \Thor"ough*wort`\, n.
   Same as {Boneset}.

Source : WordNet®

thoroughwort
     n : perennial herb of southeastern United States having
         white-rayed flower heads; formerly used as in folk
         medicine [syn: {boneset}, {agueweed}, {Eupatorium
         perfoliatum}]