diphenol

from The Century Dictionary.

• noun One of several isomeric compounds. The most important is the diorthoderivative HOC₆H₄C₆H₄OH(2:2), prepared by heating fluorin with potassium hydroxid at 400° C. It forms crystals melting at 98° C.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry Any compound that has two phenol groups; especially the isomeric benzenediols (catechol, resorcinol and hydroquinone).