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a catheter that is inserted into the trachea through the mouth or nose in order to maintain an open air passage or to deliver oxygen or to permit the suctioning of mucus or to prevent aspiration of the stomach contents
a type of endoscope that is inserted into a joint for visual examination
a tubular acoustic device inserted in the exhaust system that is designed to reduce noise
the hole where a key is inserted
plug of cotton or other absorbent material; inserted into wound or body cavity to absorb exuded fluids (especially blood)