any of a genus (Tanacetum) of plants of the composite family; esp., a poisonous weed (T. vulgare) with strong-smelling foliage and flat-topped clusters of small, yellow, rayless flower heads
Origin of tansyMiddle English ; from Old French tanesie ; from Vulgar Latin an unverified form tanaceta ; from Late Latin tanacetum ; from uncertain or unknown; perhaps
Any of several plants of the genus Tanacetum of the composite family, especially T. vulgare, native to Eurasia, having corymbs of buttonlike yellow flower heads and aromatic, finely divided leaves that are sometimes used medicinally.
Origin of tansyMiddle English, from Old French tanesie, from Vulgar Latin *tanacēta, from Late Latin tanacētum, wormwood.
(countable and uncountable, plural tansies)