panacea

noun3

1. •
   A remedy believed to cure all disease and prolong life that was originally sought by alchemists; a cure-all.
2. •
   A solution to all problems.

   • A monorail will be a panacea for our traffic woes.
3. •
   (no longer used) The plant allheal (Valeriana officinalis), believed to cure all ills.

   • There, whether it diuine Tobacco were, / Or Panachaea, or Polygony, / She found, and brought it to her patient deare […] — 1590