Madwort definitions

măd'wûrt', -wôrt'
A low-growing plant (Asperugo procumbens) with small blue flowers, native to Eurasia and naturalized in North America.
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Any of the alyssums.
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Origin of madwort

Sense 1, perhaps alteration (influenced by madder) of Dutch mede madder wort (from the use of A. procumbens to make a dye) Sense 2, originally a name for various plants supposed to cure rabies, and later also for plants of the genus Alyssum mad rabid wort (partial translation of Latin alyssum) (from Greek alusson alyssum)