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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Callosum  \Cal*lo"sum\,  n.  [NL.,  fr  callosus  callous,  hard.] 
  The  great  band  commissural  fibers  which  unites  the  two 
  cerebral  hemispheres.  See  {corpus  callosum},  under  {Carpus}.