quinone

qui·none

noun \kwin-ˈōn, ˈkwin-ˌ\

Definition of QUINONE

1

: either of two isomeric cyclic crystalline compounds C₆H₄O₂ that are extremely irritating to the skin and mucous membranes

2

: any of various usually yellow, orange, or red quinonoid compounds including several that are biologically important as coenzymes, hydrogen acceptors, or vitamins