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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.
This entry comes from Encyclopædia Britannica Concise. For the full entry on tansy, visit Britannica.com.