The organs that make urine and remove it from the body. The urinary system is divided into two parts. The upper urinary system includes the kidneys and ureters. The lower urinary system includes the bladder and urethra. The kidneys remove waste and extra fluid from the blood to make urine. The urine flows from the kidneys through the ureters to the bladder. It is stored in the bladder until it leaves the body through the urethra. Also called urinary tract.

https://www.cancer.gov/publications/dictionaries/cancer-terms/def/urinary-system