obturate
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Webster's Dictionary (1913)
Ob′tu·rate transitive verb [past tense & past participle Obturated; present participle & verbal noun Obturating.]
Origin: L. obturatus; p.p. of obturare.
To stop or close, as an opening; specif., Ordnance, to stop (a gun breech) so as to prevent the escape of gas in firing.
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54 · with additions: 1913 supplement