from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. The act of closing or stopping up, or the state or condition of being obstructed or closed.
  • n. Specifically, in gunnery, the act of closing a hole, joint, or cavity so as to prevent the flow of gas through it: as, the obturation of a vent, or of a powder-chamber. See fermeture, gas-check, obturator.


Latin obturare to stop up: compare French obturation. (Wiktionary)


  • The obturation is a modification of the De Bange system, proposed by Vavasseur.

    Scientific American Supplement, No. 586, March 26, 1887

  • This helps achieve "concentric obturation" of the slug, which is what engineers say when they mean that the slug expands to seal in the bore without becoming misshapen and off-centered.

    Full-Bore Ahead

  • Do you do primary tooth pulpectomy? what technique and obturation material do you use? is it possible to do post or core bulid-up?

    Just Got an e-mail-Bad Decay on a Two Year Old's Teeth

  • The obturation being incomplete, it may be impossible by palpation to decide that thrombosis really exists.

    Lameness of the Horse Veterinary Practitioners' Series, No. 1

  • The Company believes it is a leading U.S. manufacturer or distributor of prophy angles and cups, liquid surface disinfectants, dental micro-applicators and obturation units designed for warm, vertical condensation.

  • The barrel features six-rib polygonal rifling to reduce wear and to increase obturation between the projectile and the bore.


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