Vasectomy is a minor surgical procedure wherein the vasa deferentia of a man are severed, and then tied/sealed in a manner which prevents sperm from entering the seminal stream (ejaculate). Vasectomy should not be confused with castration (male), which is the surgical removal of the testicle(s).
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vasectomy An operation to cut or tie off the two tubes that carry sperm out of the testicles.