noun a yellow crystalline water-soluble unsaturated ketone manufactured from aniline and used in the production of dyestuffs. Formula: C6H4O2 Also called quinone Systematic name cyclohexadiene-1,4-quinone Historical Examples Coal Raphael Meldola
a colorless or yellowish liquid, C 7 H 5 Cl 3 , used chiefly in the manufacture of dyes. Historical Examples Coal Raphael Meldola
a colorless, flammable liquid, C 7 H 5 F 3 , used chiefly as an intermediate in the manufacture of dyes and pharmaceuticals, and as a solvent.