- The process of extinguishing, removing, or diminishing a physical property such as heat or light, rapidly cooling a hot metal rapidly by plunging it into water or oil.
- In beta liquid scintillation counting, the shifting of the energy spectrum from a true to a lower energy; it is caused by a variety of interfering materials in the counting solution, including foreign chemicals and coloring agents.
- The process of stopping a chemical or enzymatic reaction.
[M. E. quenchen, fr. O.E. acwencan]
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Examples: glitazone, GI cocktail, etc.