(Science: anatomy, urology) The tube that conveys urine from the bladder to the outside. In the female it measures 25.4 to 38.1 millimetres, in the male 25 centimetres. Duct through which urine is discharged in most mammals and which serves as the male genital duct.The duct responsible for discharging urine from the bladder to the external environment. The urethra in male organisms is also responsible for transporting semen for reproductive purposes.

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