(1):

(n.) An apparatus designed to close an unnatural opening, as a fissure of the palate.

(2):

(n.) That which closes or stops an opening.

(3):

(n.) A camera shutter.

(4):

(n.) Any device for preventing the escape of gas through the breech mechanism of a breech-loading gun; a gas check.

(5):

(a.) Serving as an obturator; closing an opening; pertaining to, or in the region of, the obturator foramen; as, the obturator nerve.