What Is the Meaning of Enediol?

This is the chemical structure of catechol.
This is the chemical structure of the enediol catechol. NEUROtiker/PD

An enediol is an alkene enol with a hydroxyl group attached to both carbon atoms of the carbon double bond

An example: Catechol is an enediol. Two of the hydroxyl groups are attached to one of the carbon double bonds in the benzene ring.