The crossword solution for the term MEDICINAL LEGUME is SENNA, a five-letter word. SENNA is a genus of flowering plants in the legume family Fabaceae. It is native to tropical and subtropical regions of the world, and has been used for centuries as a medicinal plant. SENNA is known for its laxative properties, and is commonly used to treat constipation. It is also used to treat other digestive issues, such as irritable bowel syndrome.