noun
(surgery) An object used to obstruct a hole, such as a fissure of the palate.
(anatomy) The membrane vessels, etc. that close the obturator foramen, or thyroid foramen, a large opening or fenestra in the anterior part of the hip bone.
(engineering) A valve closure member (disk, gate, plug, etc.).
(firearms) Any device for preventing the escape of gas through the breech mechanism of a breech-loading gun; a gas check.
(photography) A camera shutter.
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