The Collaborative International Dictionary of English v.0.48:

Tartralic \Tar*tral"ic\, a. [From Tartar the chemical
   compound.] (Chem.)
   Pertaining to, or designating, an acid obtained as a white
   amorphous deliquescent substance, C8H10O11; -- called also
   ditartaric, tartrilic, or tartrylic acid.
   [1913 Webster]