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n. A sharp-pointed surgical instrument, used with a cannula to puncture a body cavity for fluid aspiration.

n. A pointed hollow cylindrical device used to make small incisions and surgically insert cannulas, etc., into body cavities, or to aspirate fluids.

n. A stylet, usually with a triangular point, used for exploring tissues or for inserting drainage tubes, as in dropsy.

n. A surgical instrument used for withdrawing fluid from the body in cases of dropsy, hydrocele, etc.

"The operation is performed with a combined instrument called the trocar and cannula."

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