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Webster 1913 Edition

Noun.

[L.

obturare

to stop up: cf. F.

obturation

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

“Deaf by an outward obturation.”

Bp. Hall.

Noun.

[L. obturatus, from obturo, to stop up.]

The act of stopping by spreading over or covering.

obturation ‎(countable and uncountable, plural obturations)

The act of stopping up, or closing, an opening.
- Bishop Hall
  Deaf by an outward obturation.
(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.

obturation f ‎(plural obturations)