noun, plural tansies.
any of several composite plants of the genus Tanacetum, especially a strong-scented, weedy, Old World herb, T. vulgare, having flat-topped clusters of tubular yellow flowers.

1225–75; Middle English < Old French tanesie, aphetic variant of atanesie < Medieval Latin athanasia < Greek athanasía immortality, equivalent to a- a-6 + thánat(os) death (see Thanatos) + -ia -y3, with ti < si

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World English Dictionary
tansy (ˈtænzɪ)
n , pl -sies
1.  any of numerous plants of the genus Tanacetum, esp T. vulgare, having yellow flowers in flat-topped clusters and formerly used in medicine and for seasoning: family Asteraceae (composites)
2.  any of various similar plants
[C15: from Old French tanesie, from Medieval Latin athanasia tansy (with reference to its alleged power to prolong life), from Greek: immortality]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

(Tanacetum vulgare), c.1265, from O.Fr. tanesie (13c.), from Gallo-Romance *tanaceta, from L.L. tanacetum "wormwood," from aphetic form of Gk. athanasia "immortality," so called probably for its persistence. English folklore associates it with pregnancy, either as an aid to contraception or to provoke
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
State and local laws require the removal of tansy ragwort and other noxious weeds.
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