panacea

Short definition from Wiktionary

Noun

1. 1
   A remedy believed to cure all disease and prolong life that was originally sought by alchemists; a cure-all.
2. 2
   A solution to all problems.
3. 3
   The plant allheal (Valeriana officinalis), believed to cure all ills.

Proper noun

1. 1
   The goddess/personification of healing, remedies, cures and panaceas (medicines, salves, ointments and other curatives). She is a daughter of Asclepius and Epione.