OBTURATION

Etymology

Noun

obturation (countable and uncountable, plural obturations)

The act of stopping up, or closing, an opening.

• Bishop Hall

(firearms) 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.

Source: Wiktionary

Ob`tu*ra"tion, n. Etym: [L. obturare to stop up: cf.F. obturation.]

Definition: The act of stopping up, or closing, an opening. "Deaf by an outward obturation." Bp. Hall.

Source: Webster’s Unabridged Dictionary 1913 Edition