what is an obturator
obturator. 1. a disk or plate that closes an opening. 2. a prosthesis for closing an acquired or congenital opening of the palate (cleft palate). obturator sign pain on outward pressure on the obturator foramen as a sign of inflammation in the sheath of the obturator nerve, probably caused by appendicitis.(ob'tÅ«-rÄ'tÅr),ny structure that occludes an opening. 2. Denoting the obturator foramen, the obturator membrane, or any of several parts in relation to this foramen. 3. A prosthesis used to close an opening in the hard palate, usually in a cleft palate.