The Collaborative International Dictionary of English v.0.48:

Obturator \Ob"tu*ra`tor\, a. (Anat.)
   Serving as an obturator; closing an opening; pertaining to,
   or in the region of, the obturator foramen; as, the obturator
   nerve.
   [1913 Webster]

   Obturator foramen (Anat.), an opening situated between the
      public and ischial parts of the innominate bone and closed
      by the obturator membrane; the thyroid foramen.
      [1913 Webster]