WordNet (r) 3.0 (2006):

purging cassia
    n 1: deciduous or semi-evergreen tree having scented sepia to
         yellow flowers in drooping racemes and pods whose pulp is
         used medicinally; tropical Asia and Central and South
         America and Australia [syn: golden shower tree,
         drumstick tree, purging cassia, pudding pipe tree,
         canafistola, canafistula, Cassia fistula]