D defs.my
Entry 1 sense Webster, 1913

Orvietan

/ôr'vē-ātʹn/ · Or·vi·e·tan · IPA /ˌɔːvɪˈeɪtən/
01 n. A kind of antidote for poisons; a counter poison formerly in vogue.
  1. 1.
    A kind of antidote for poisons; a counter poison formerly in vogue.[Obs.]