Sen"na (?), n. [Cf. It. & Sp. sena, Pg. sene, F. s'en'e; all fr. Ar. sana.]
The leaves of several leguminous plants of the genus Cassia. (C. acutifolia. C. angustifolia, etc.). They constitute a valuable but nauseous cathartic medicine.
The plants themselves, native to the East, but now cultivated largely in the south of Europe and in the West Indies.
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.
© Webster 1913.