See Also: thoroughwort(dictionary)

thoroughwort (iou)



thoroughwort noun. L16.
[from THOROUGH- + WORT noun1, after THOROW-WAX.]
= THOROW-WAX. rare. Only in L16.
A N. American plant of the composite family, Eupatorium perfoliatum, having opposite leaves united at the base so that the stem appears to grow through them and corymbs of white flowers, which is valued for its tonic properties (also called boneset). Also (with specifying word), any of various other N. American plants of this genus. E19.