Ob″tu‐rate (?), v. t. [imp. & p. p.Obturated (?); p. pr. & vb. n.Obturating (?).] [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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.