Tansy definitions

tăn'zē
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.
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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.
noun
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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.
noun
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A herbaceous plant with yellow flowers, of the genus Tanacetum, especially Tanacetum vulgare.
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Origin of tansy

From Old French tanesie, tanoisie et al., aphetic form of athanasie, from Medieval Latin athanasia, from Ancient Greek ἀθανασία (athanasia, “immortality").