vinum opii

from The Collaborative International Dictionary of English v.0.48

Vinum \Vi"num\, n.; pl. {Vina}. [L. See {Wine}.]
   Wine, -- chiefly used in Pharmacy in the name of solutions of
   some medicinal substance in wine; as:

   {vina medicata}, medicated wines;

   {vinum opii}, wine of opium.
      [Webster 1913 Suppl.]