a. [ Pyro- + L. uva a grape. ] (Chem.) Pertaining to, or designating, an acid (called also pyroracemic acid) obtained, as a liquid having a pungent odor, by the distillation of racemic acid. [ 1913 Webster ]

a. [ L. uva grape. ] (Chem.) Pertaining to, or obtained from, grapes; specifically, designating an organic acid, C7H8O3 (also called pyrotritartaric acid), obtained as a white crystalline substance by the decomposition of tartaric and pyrotartaric acids. [ 1913 Webster ]