from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Related to protocatechuic acid, protocatechuic aldehyde or their derivatives
from the GNU version of the Collaborative International Dictionary of English
- adj. 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.
from The Century Dictionary and Cyclopedia
- Derived from catechol.
From proto- + catechuic (Wiktionary)