thoroughwortEtymologyFrom thorough (“through”) + wort: the leaf bases are joined, so it looks like the stem is growing through a single leaf.thoroughwort means any of several plants of the genus Eupatorium. Lexicurio rates it Rare gem — a strength score of 82 out of 100.nounAny of several plants of the genus Eupatorium.Common boneset (Eupatorium perfoliatum).