system - a group of physiologically or anatomically related organs or parts; "the body has a system of organs for digestion"

excretory organ, urinary organ - an organ that separates waste substances from the blood and discharges them

genital system, reproductive system - organs and tissues involved in the production and maturation of gametes and in their union and subsequent development as offspring

urinary tract - the organs and tubes involved in the production and excretion of urine

urinary bladder - a membranous sac for temporary retention of urine

ureter - either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder

urethra - duct through which urine is discharged in most mammals and which serves as the male genital duct