n.
Pronunciation: ' se-n ə
Function: noun
Etymology: New Latin, from Arabic san ā
Date: 1543
1 : any of a genus ( Cassia syn. Senna ) of leguminous herbs, shrubs, and trees native to warm regions especially : one used medicinally
2 : the dried leaflets or pods of various sennas (esp. C. angustifolia syn. Senna alexandrina ) used as a purgative