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a hypodermic syringe used to inject local anesthetics, especially in dentistry. Before administration of a local anesthetic at the desired location, the operator applies negative pressure checking for blood in the syringe. This ensures that the anesthetic solution will not be deposited in a blood vessel.
as·pi·rat·ing sy·ringe(aspir-āt-ing sĭr-inj)
A syringe, commonly used to inject local anesthetic in dentistry, which allows blood into the anesthetic capsule if the needle is in a blood vessel.