Source : Webster's Revised Unabridged Dictionary (1913)

Wartwort \Wart"wort`\, n. (Bot.)
   A name given to several plants because they were thought to
   be a cure for warts, as a kind of spurge ({Euphorbia
   Helioscopia}), and the nipplewort ({Lampsana communis}).

Source : WordNet®

wartwort
     n : not unattractive European weed whose flowers turn toward the
         sun [syn: {sun spurge}, {wartweed}, {devil's milk}, {Euphorbia
         helioscopia}]