noun
also tan·sey ˈtanzē, ˈtaan-, -zi
( plural tansies or tanseys )
Etymology: Middle English tansy, tanesey, from Old French tanesie, from Medieval Latin athanasia medicine to prolong life, tansy, from Greek, immortality, from a- a- (II) + -thanasia (from thanatos death) — more at thanat-
1.
a. : a plant of the genus Tanacetum ; especially : a common herb ( T. vulgare ) with a strong aromatic odor and a very bitter taste
b. : any of various other plants: as
(1) : silverweed a
(2) : tansy ragwort
2. : a tansy-flavored cake or pudding