Panacea
PANACEA (Gr. TvavaKeta, all-healing, from ttSs, all, and aKetcrdaL, to heaV), a universal remedy, or cure for all diseases, a term applied in the middle ages to a mythical herb supposed to possess this quahty. Many herbs have had the power of curing all diseases attributed to them, and have hence had the name of " all-heal "; such have been, among others, the mistletoe, the woundwort (Slac/iys palustris), the yarrow or milfoil, and the great valerian.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)