tartralic

from The Century Dictionary.

• Noting an acid, a colorless, amorphous, very deliquescent compound, C₈H₁₀O₁₁, prepared by heating tartaric acid, of which it is an anhydrid, at 140–150° C. Also called ditartrylic acid.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Pertaining to, or designating, an acid obtained as a white amorphous deliquescent substance, C8H10O11; -- called also ditartaric, tartrilic, or tartrylic acid.