"Urine output" refers to the amount of urine that a person produces. It is a measure of how much liquid waste the body eliminates through the urinary system. Full definition
The magnesium loss appears to be secondary to higher concentrations of glucose in the kidney that increase urine output [2]. (ods.od.nih.gov)
Change in urine output and thirst - Dogs should not drink more water simply because they are old, it is summer time, or the heater is on in the winter. (thesprucepets.com)
Second, the majority (82 %) of urine output over the 4 - h period had been passed by this point. (academic.oup.com)