'Protocatechuic' definitions:

Definition of 'Protocatechuic'

From: GCIDE

Protocatechuic \Pro`to*cat`e*chu"ic\, a. (Chem.) Pertaining to, derived from, or designating, an organic acid which is obtained as a white crystalline substance from catechin, asafetida, oil of cloves, etc., and by distillation itself yields pyrocatechin. [1913 Webster]