Definitions for obturation
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Wiktionary
obturation(Noun)
The process of a bullet expanding under pressure to fit the bore of the firearm, or a cartridge case expanding under pressure to seal the chamber.
Webster Dictionary
Obturation(noun)
the act of stopping up, or closing, an opening
Citation
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"obturation." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/obturation>.