obturator
noun
either of the muscles, external and internal, covering the opening (obturator foramen) in the pelvis, formed by the pubis and ischium.
The grammatical form denoting more than one person, place, thing, or idea.
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These bolts were driven outside, and obturators wadded with indiarubber corked up the hole that let them through.
From The Moon-Voyage by Verne, Jules