The Collaborative International Dictionary
Pyrotartaric
Pyrotartaric \Pyr`o*tar*tar"ic\, a. [Pyro- + tartaric.] (Chem.) Pertaining to, or designating, an acid obtained as a white crystalline substance by the distillation of tartaric acid.
Wiktionary
pyrotartaric
a. (context chemistry English) of, or relating to pyrotartaric acid or its derivatives