1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Grandsire  \Grand"sire"\,  n.  [OF.  grantsire.  See  {Grand},  and 
  {Sire}.] 
  Specifically,  a  grandfather;  more  generally,  any  ancestor. 

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