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tansy (n.)

perennial herb native to northern Eurasia, mid-13c., from Old French tanesie (13c., Modern French tanaisie), from Vulgar Latin *tanaceta (neuter plural mistaken for fem. singular), from Late Latin tanacetum "wormwood," from shortened form of Greek athanasia "immortality," from athanatos "immortal," from a- "not," privative prefix, + thanatos "death" (see thanatology). So called probably for its persistence. English folklore associates it with pregnancy, either as an aid to contraception or to provoke miscarriage.

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Definitions of tansy from WordNet

tansy (n.)
common perennial aromatic herb native to Eurasia having buttonlike yellow flower heads and bitter-tasting pinnate leaves sometimes used medicinally;
Synonyms: golden buttons / scented fern / Tanacetum vulgare
From wordnet.princeton.edu