The Collaborative International Dictionary of English v.0.48:

Tartarize \Tar"tar*ize\, v. t. [imp. & p. p. Tartarized; p.
   pr. & vb. n. Tartarizing.] [Cf. F. tartariser.] (Chem.)
   To impregnate with, or subject to the action of, tartar. [R.]
   [1913 Webster]

   Tartarized antimony (Med. Chem.), tartar emetic.
      [1913 Webster]