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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Bolthead  \Bolt"head`\,  n. 
  1.  (Chem.)  A  long,  straight-necked,  glass  vessel  for  chemical 
  distillations;  --  called  also  a  {matrass}  or  receiver. 
  2.  The  head  of  a  bolt.