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Varicocele   A varicose vein of the testicles, sometimes a cause of male infertility.   Vas deferens   A pair of thick-walled tubes about 45 cm long in the male that lead from the epididymis to the ejaculatory duct in the prostate. During ejaculation, the ducts make wavelike contractions to propel sperm forward.   Vial   Container holding a drug, usually with a rubber top that a syringe needle can be put through   Voltaren   Drug company name for a non-steroidal anti-inflammatory drug