Epididymis: A structure within the scrotum that is attached to the back side of the testis. The epididymis is a coiled segment of the spermatic ducts that stores spermatozoa while they mature and then transports the spermatozoa between the testis and the tube connecting the testes with the urethra (vas deferens).
Quick GuideErectile Dysfunction (ED) Causes and Treatment
Subscribe to MedicineNet's Men's Health Newsletter
Men's Health Resources
Last Editorial Review: 5/13/2016