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Definition of TANSY
: a common Old World composite herb (Tanacetum vulgare) that is naturalized in North America and has bitter-tasting finely divided aromatic leaves and clustered yellow flower heads lacking ray flowers; broadly: a plant of the same genus
Origin of TANSY
Middle English tansey, from Anglo-French tanesie, from Late Latin tanacita
Any of about 150 species of strong-smelling, poisonous herbs, especially common tansy (Tanacetum vulgare), of the aster family (Asteraceae), native to the northern temperate zone. T. vulgare has button-shaped yellow flower heads of disk flowers (no ray flowers) that are arranged in a flat-topped cluster, deeply cut leaves, and many stems. It is sometimes cultivated in herb gardens and was formerly used in medicines and insecticides. See alsochrysanthemum.