urination

n. discharging of urine, discharging of fluid excrement

Urination, known by physiologists as micturition, or more simply as voiding, is the process of disposing urine from the urinary bladder through the urethra to the outside of the body. In healthy adults, the process of urination is under voluntary control; in infants and individuals with neurological injury, urination may occur as an involuntary reflex.
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Urination /uri·na·tion/ the discharge of urine. u·ri·na·tion n. The passing of urine. Also called emiction, miction, micturition, uresis. [more]Urination - Community and Resources

Noun
1. the discharge of urine
(synonym) micturition
(hypernym) elimination, evacuation, excretion, excreting, voiding
(hyponym) leak, wetting, making water, passing water
(derivation) make, urinate, piddle, puddle, micturate, piss, pee, pee-pee, make water, relieve oneself, take a leak, spend a penny, wee, wee-wee, pass water

n. urination, discharging of urine, discharging of fluid excrement