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home / medterms medical dictionary a-z list / urethra definition Medical Definition of Urethra Urethra: The tube that leads from the bladder and transports and discharges urine outside the body. In males, the urethra travels through the penis and carries semen as well as urine. In females, the urethra is shorter than in the male, and it emerges above the vaginal opening. What Kind of Doctor Do I Need?
The length of the male urethra varies according to age and from person to person. In adult men, the length of the urethra, about 18 cm, varies also according to penile length. The urethra serves to bring urine contained in the bladder and seminal fluid (which contains spermatozoa) to the exterior. The male urethra can be subdivided into various parts based on different criteria.