TANACETUM, in botany, a genus of the syngenesia polygamia æqualis class. The receptacle is naked; and the calix is hemispherical and imbricated. There are eight species, only one of them, viz. the vulgare, or common tanfy, a native of Britain.
Tanzy, considered as a medicine, is a moderately warm bitter, and is much extolled by some in hysterical complaints, especially if proceeding from a deficiency or suppression of the uterine purgations: its seeds and leaves have been in considerable esteem as anthelmintics; and are said to be good in colics and flatulencies.