Vestibula

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Vestibulum \Ves*tib"u*lum\, n.; pl. {Vestibula}. [L.,
     vestibule.] (Zool.)
     A cavity into which, in certain bryozoans, the esophagus and
     anus open.
     [1913 Webster]