1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Vestibulum  \Ves*tib"u*lum\,  n.;  pl  {Vestibula}.  [L., 
  vestibule.]  (Zo["o]l.) 
  A  cavity  into  which  in  certain  bryozoans,  the  esophagus  and 
  anus  open 

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