Definitions
1.NounAn object used to obstruct a hole, such as a fissure of the palate.
2.NounThe membrane vessels, etc. that close the obturator foramen, or thyroid foramen, a large opening or fenestra in the anterior part of the hip bone.
3.NounA valve closure member (disk, gate, plug, etc.).
4.NounAny device for preventing the escape of gas through the breech mechanism of a breech-loading gun; a gas check.
5.NounA camera shutter.