Definition of wallwort

: any of several plants that grow on or in walls: such as
a : danewort
c : a stonecrop (Sedum acre)
d : wall rue

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History and Etymology for wallwort

alteration (influenced by wall entry 1) of earlier walwort danewort, from Middle English walwort, walwurt, from Old English wealhwyrt, literally, foreign herb, from Wealh Welshman, foreigner + wyrt herb, root; probably from the belief that it grew where Welsh blood was spilled

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