Source : Webster's Revised Unabridged Dictionary (1913)

Decoherer \De`co*her"er\, n. [Pref. de- + coherer.] (Elec.)
   A device for restoring a coherer to its normal condition
   after it has been affected by an electric wave, a process
   usually accomplished by some method of tapping or shaking, or
   by rotation of the coherer.