1590s, from Medieval Latin urinatus, past participle of urinare, from urina (see urine). Related: Urinated; urinating.
urinate u·ri·nate (yur'ə-nāt')
v. u·ri·nat·ed, u·ri·nat·ing, u·ri·nates
To excrete urine.
urination u·ri·na·tion (yur'ə-nā'shən)
n.
The passing of urine. Also called emiction, miction, micturition, uresis.