|prōd.(ˌ)ō+| ̷ ̷ ̷ ̷ˌ ̷ ̷| ̷ ̷ ̷ ̷ˌ ̷ ̷ noun
or pro·to·cat·e·chu·ic aldehyde “+|kad.ə|chüik, -|shüik, -|kyüik-
Etymology: protocatechualdehyde International Scientific Vocabulary protocatechu ic acid + aldehyde
: a crystalline compound C 6 H 3 (OH) 2 CHO which is synthetically prepared and the monomethyl ether of which is vanillin; 3,4-dihydroxy-benzaldehyde