elixir
/ɪˈlɪksə(r); ɪ`lɪksɚ/ n[U, C]
1 imaginary substance with which medieval scientists hoped to change metals into gold or make people live for ever （中世纪科学家希望得到的）炼金药, 长生不老药
the elixir of life 长生不老药.
2 imaginary cure for all ills （想像中的）灵丹妙药, 万灵药.