any of numerous plants of the genus Tanacetum, esp T. vulgare, having yellow flowers in flat-topped clusters and formerly used in medicine and for seasoning: family Asteraceae (composites)
2.
any of various similar plants
Word origin
C15: from Old French tanesie, from Medieval Latin athanasia tansy (with reference to its alleged power to prolong life), from Greek: immortality
tansy in American English
(ˈtænzi)
nounWord forms: pluralˈtansies
any of a genus (Tanacetum) of plants of the composite family; esp., a poisonous weed (T. vulgare) with strong-smelling foliage and flat-topped clusters of small, yellow, rayless flower heads