senna

n. [ Cf. It. & Sp. sena, Pg. sene, F. séné; all fr. Ar. sanā. ] 1. (Med.) The leaves of several leguminous plants of the genus Cassia. (Cassia acutifolia, Cassia angustifolia, etc.). They constitute a valuable but nauseous cathartic medicine. [ 1913 Webster ]

2. (Bot.) The plants themselves, native to the East, but now cultivated largely in the south of Europe and in the West Indies. [ 1913 Webster ]

Bladder senna. (Bot.) See under Bladder. --
Wild senna (Bot.), the Cassia Marilandica, growing in the United States, the leaves of which are used medicinally, like those of the officinal senna. [ 1913 Webster ]