1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Growan  \Grow"an\,  n.  [Cf.  Arm.  grouan  gravel,  Corn.  grow  gravel, 
  sand.]  (Mining.) 
  A  decomposed  granite,  forming  a  mass  of  gravel,  as  in  tin 
  lodes  in  Cornwall. 

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