Source : Webster's Revised Unabridged Dictionary (1913)

Urinate \U"ri*nate\, v. i. [LL. urinare.]
   To discharge urine; to make water.

Source : WordNet®

urinate
     v 1: pass after the manner of urine; "The sick men urinated
          blood"
     2: eliminate urine; "Again, the cat had made on the expensive
        rug" [syn: {make}, {piddle}, {puddle}, {micturate}, {piss},
         {pee}, {pee-pee}, {make water}, {relieve oneself}, {take
        a leak}, {spend a penny}, {wee}, {wee-wee}, {pass water}]