senna: Meaning and Definition of

sen•na

1. any plant, shrub, or tree belonging to the genus Cassia, of the legume family, having pinnate leaves and large clusters of flowers.
2. any of various cathartic drugs consisting of the dried leaflets of certain of these plants, as one drugderived from C. acutifolia, or anotherderived from C. angustifolia.
3. See