1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Wad  \Wad\,  Wadd  \Wadd\,  n.  (Min.) 
  a  An  earthy  oxide  of  manganese,  or  mixture  of  different 
  oxides  and  water,  with  some  oxide  of  iron,  and  often 
  silica,  alumina,  lime,  or  baryta;  black  ocher.  There 
  are  several  varieties. 
  b  Plumbago,  or  black  lead. 

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