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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Calcar  \Cal"car\,  n.;  L.  pl  {Calcaria}.  [L.,  a  spur,  as  worn  on 
  the  heel,  also  the  spur  of  a  cock,  fr  calx,  calcis,  the 
  1.  (Bot.)  A  hollow  tube  or  spur  at  the  base  of  a  petal  or 
  2.  (Zo["o]l.)  A  slender  bony  process  from  the  ankle  joint  of 
  bats,  which  helps  to  support  the  posterior  part  of  the 
  web,  in  flight. 
  3.  (Anat.) 
  a  A  spur,  or  spurlike  prominence. 
  b  A  curved  ridge  in  the  floor  of  the  leteral  ventricle 
  of  the  brain;  the  calcar  avis,  hippocampus  minor,  or