[ob-tuh-reyt, -tyuh-]
verb (used with object), obturated, obturating.
to stop up; close.
Ordnance. to close (a hole or cavity) so as to prevent a flow of gas through it, especially the escape of explosive gas from a gun tube during firing.

1550–60; < Latin obtūrātus, past participle of obtūrāre to block, stop up

obturation, noun
obturator, noun
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World English Dictionary
obturate (ˈɒbtjʊəˌreɪt)
(tr) to stop up (an opening, esp the breech of a gun)
[C17: from Latin obtūrāre to block up, of obscure origin]

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American Heritage
Medical Dictionary

obturate ob·tu·rate (ŏb'tə-rāt', -tyə-)
v. ob·tu·rat·ed, ob·tu·rat·ing, ob·tu·rates
To close or obstruct.

ob'tu·ra'tion n.

obturator ob·tu·ra·tor (ŏb'tə-rā'tər, -tyə-)

  1. A structure, such as the soft palate, that closes an opening in the body.

  2. A prosthetic device that serves to close an opening or cleft, especially in the palate.

  3. A stylus or removable plug used during the insertion of many tubular instruments.

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Example sentences
The obturator in turn would push against the projectile.
When it is absent, the hip-joint receives two branches from the obturator nerve.
The ventral division of the second unites with the ventral divisions of the third and fourth nerves to form the obturator nerve.
Obturator, is a term used to refer to an object used to obstruct a hole.
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