Sĕn'nā, n.

n. [It. & Sp. sena, Pg. senne, Fr. séné, from Ar. sanā or senâ.] (Bot.) A leguminous plant, and especially its leaves, which last are largely used in medicine as a cathartic. They are obtained from various species of Cassia, native to the East, but now cultivated largely in the south of Europe and the West Indies. Lindley.

Wild senna, the Cassia Marylandica, growing in the United States, the leaves of which are used as those of the officinal senna. Gray.