elixir

Short definition from Wiktionary

Noun

1. 1
   A liquid which converts lead to gold.
2. 2
   A substance or liquid which is believed to cure all ills and give eternal life.
3. 3
   The alleged cure for all ailments; cure-all, panacea.
4. 4
   A sweet flavored liquid (usually containing a small amount of alcohol) used in compounding medicines to be taken by mouth in order to mask an unpleasant taste.