either of two isomeric compounds, CHO, especially the yellow, crystalline isomer used in making dyes
any of a series of compounds of this type
Origin:
quin(ic acid) + -one
See quinone in American Heritage Dictionary 4
noun
Any of a class of aromatic compounds found widely in plants, especially the yellow crystalline form, C6H4O2, used in making dyes, tanning hides, and photography.