/tan"zee/ , n. , pl. tansies .
any of several composite plants of the genus Tanacetum, esp. a strong-scented, weedy, Old World herb, T. vulgare, having flat-topped clusters of tubular yellow flowers.
[ 1225-75; ME tanesie, aph. var. of atanesie athanasia athanasía immortality, equiv. to a- A- 6 + thánat ( os ) death (see THANATOS) + -ia -Y 3 , with ti si ]