A yellow flowering plant with feathery leaves that was historically used as a medicine and to flavor food, though it can be poisonous in large amounts.
From Old French 'tanaisie' and Greek 'athanasia' meaning 'immortality,' because the plant stays fresh for a long time. Ancient people believed it could prolong life.
Medieval people used tansy to flavor Easter cakes and made tansy wine, but they were unknowingly playing with poison—the plant contains thujone, the same psychoactive compound in absinthe, so they were literally getting high off their holiday desserts.
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