philtre

from WordNet (r) 3.0 (2006)

philtre
    n 1: a drink credited with magical power; can make the one who
         takes it love the one who gave it [syn: {philter},
         {philtre}, {love-potion}, {love-philter}, {love-philtre}]

from The Collaborative International Dictionary of English v.0.48

Philter \Phil"ter\, n. [F. philtre, L. philtrum, Gr. fi`ltron,
   fr. filei^n to love, fi`los dear, loving.]
   A potion or charm intended to excite the passion of love.
   [Written also {philtre}.] --Addison.
   [1913 Webster]