- A white silvery bean used in Draught of Living Death.
- According to the Half-Blood Prince's Potion Book, it's better to crush the sopophorous bean with a silver dagger than to chop it. When Harry follows these instructions, his Draught of the Living Death turns out perfectly, and he wins a bottle of Felix Felicis from Professor Slughorn.
Harry encounters the soporphorous bean during N.E.W.T. level Potions in Sixth Year with Professor Slughorn.
Similar to "soporific," or "sleep inducing" from the Latin "sopor" for "deep sleep"