fistula : Idioms & Phrases
cassia fistula
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noun 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
drumstick tree; purging cassia; canafistula; canafistola; pudding pipe tree; golden shower tree.
WordNet
Incomplete fistula
(Med.) , a fistula open at one end only.