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Definition of: senna
(sen′ə) noun
1. The dried leaflets of any one of several leguminous plants (genus Cassia), used medicinally for their purgative properties; especially, the Old World species C. acutifolia and C. angustifolia.
2. Any one of the plants yielding true senna or a similar product. [<NL senna, sena <Arabic sanā]
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