Lion's leaf
Li´on's leaf`
(lī´ŭnz lēf`)n. | 1. | (Bot.) A South European plant of the genus Leontice (Leontice leontopetalum), the tuberous roots of which contain so much alkali that they are sometimes used as a substitute for soap. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.