D defs.my
Entry 1 sense Webster, 1913

Mithridate

/mĭth'-rĭd-ātˌ/ · Mith·ri·date · IPA /ˈmɪθrəˌdeɪt/
01 n. An antidote against poison, or a composition in form of an electuary, supposed to serve either as a remedy or a preservative against poison…
  1. 1.
    An antidote against poison, or a composition in form of an electuary, supposed to serve either as a remedy or a preservative against poison; an alexipharmic; -- so called from King Mithridates, its reputed inventor.(Med.)
    “[Love is] a drop of the true elixir; no mithridate so effectual against the infection of vice.” Southey.