1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Claustrum  \Claus"trum\,  n.;  pl  {Claustra}.  [L.,  a  bolt  or  bar.] 
  (Anat.) 
  A  thin  lamina  of  gray  matter  in  each  cerebral  hemisphere  of 
  the  brain  of  man.  --  {Claus"tral},  a. 

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