1. A white crystalline substance, C6H4(OH)2, obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin
   - hydroquinone

Derived forms: quinols

• cycler
• cycles per second
• cycles/second
• cycleway
• cyclic
• cyclic disorder
• cyclic neutropenia
• cyclic redundancy check
• cyclical
• cyclically
• cyclicity
• cycling
• Cycliophora
• cyclist
• cyclo-
• cyclobenzaprine
• cyclodestructive surgery
• cyclohexanol
• cyclohexanol phthalate
• cycloid
• cycloidal
• Cycloloma
• Cycloloma atriplicifolium
• cyclometer
• cyclonal