Old English acwencan "to quench" (of fire, light), from Proto-Germanic *cwandjan, probably a causative form of root of Old English cwincan "to go out, be extinguished," Old Frisian kwinka. Related: Quenched; quenching.
quenching quench·ing (kwěn'chĭng)
The process of extinguishing, removing, or diminishing a physical property such as heat or light.
The shifting of the energy spectrum from a true to a lower energy that occurs in liquid scintillation counting of beta emissions; caused by interfering materials in the counting solution, including foreign chemicals.