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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Diluvium  \Di*lu"vi*um\,  n.;  pl  E.  {Diluviums},  L.  {Diluvia}. 
  [L.  diluvium.  See  {Dilute},  {Deluge}.]  (Geol.) 
  A  deposit  of  superficial  loam,  sand,  gravel,  stones,  etc., 
  caused  by  former  action  of  flowing  waters,  or  the  melting  of 
  glacial  ice. 
  Note:  The  accumulation  of  matter  by  the  ordinary  operation  of 
  water  is  termed  alluvium.