The Collaborative International Dictionary
oxyphenic acid
Oxyphenol \Ox`y*phe"nol\, n. (Chem.) A phenol, C6H4(OH)2, produced by the distillation of catechin; called also oxyphenic acid, and now pyrocatechin.
Wiktionary
oxyphenic acid
n. (context chemistry obsolete English) pyrocatechol