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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Commissure  \Com*mis"sure\  (?  or  ?;  134-6),  n.  [L.  commissura  a 
  joining  together:  cf  F.  commissure.  See  {Commit}.] 
  1.  A  joint,  seam,  or  closure;  the  place  where  two  bodies,  or 
  parts  of  a  body,  meet  and  unite;  an  interstice,  cleft,  or 
  2.  (Anat.  &  Zo["o]l.) 
  a  The  point  of  union  between  two  parts  as  the  angles  of 
  the  lips  or  eyelids,  the  mandibles  of  a  bird,  etc 
  b  A  collection  of  fibers  connecting  parts  of  the  brain 
  or  spinal  marrow;  a  chiasma. 
  3.  (Bot.)  The  line  of  junction  or  cohering  face  of  two 
  carpels,  as  in  the  parsnip,  caraway,  etc