perforation
Material used in upholstering just under the top fabric.
The act of perforating or the state of being perforated. / Any opening in a solid object. / (medicine) An abnormal opening in an organ, such as a rupture.
(inorganic chemistry) A binary compound of magnesium and nitrogen (Mg₃N₂).
(UK, dated, Cambridge University) One who does not try for honors at university, but is content to take a degree merely; a passman.
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