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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Coherer  \Co*her"er\,  n.  (Elec.) 
  Any  device  in  which  an  imperfectly  conducting  contact  between 
  pieces  of  metal  or  other  conductors  loosely  resting  against 
  each  other  is  materially  improved  in  conductivity  by  the 
  influence  of  Hertzian  waves;  --  so  called  by  Sir  O.  J.  Lodge 
  in  1894  on  the  assumption  that  the  impact  of  the  electic 
  waves  caused  the  loosely  connected  parts  to  cohere,  or  weld 
  together,  a  condition  easily  destroyed  by  tapping.  A  common 
  form  of  coherer  as  used  in  wireless  telegraphy  consists  of  a 
  tube  containing  filings  (usually  a  pinch  of  nickel  and  silver 
  filings  in  equal  parts)  between  terminal  wires  or  plugs 
  {conductor  plugs}).