Tansy

(fan’-ze) [O. Fr., tanasie, from Low L., tanacetiun, from aOavaala, immortality]. The Tan acetum vulgare, a plant of the order Compos i tae. The leaves and tops (Tan acetum, U. S. P.) contain a bitter principle, tan acetin, C]1H:1604, tannic acid, and an e ential oil (Oleum tanaceti). T. is an aromatic bitter and irritant narcotic, and has been used in malaria, in hysteria, and as an emmenagogue and anthelmintic. In overdoses it produces abdominal pain, vomiting, epileptiform convulsions, and death from failure of respiration. Dose gr. xxx-gj (2.0-4.0); of the oil mj-iv (0.065-0.26). Tap. I. A sudden slight blow. 2. To empty of fluid, as, e. g., to tap a hydrocele. 617