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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Demilune  \Dem"i*lune`\,  n.  [F.  demi-  lune.] 
  1.  (Fort.)  A  work  constructed  beyond  the  main  ditch  of  a 
  fortress,  and  in  front  of  the  curtain  between  two 
  bastions,  intended  to  defend  the  curtain;  a  ravelin.  See 
  2.  (Physiol.)  A  crescentic  mass  of  granular  protoplasm 
  present  in  the  salivary  glands. 
  Note:  Each  crescent  is  made  of  polyhedral  cells  which  under 
  some  circumstances  are  supposed  to  give  rise  to  new 
  salivary  cells.