• WordNet 3.6
    • v micturate eliminate urine "Again, the cat had made on the expensive rug"
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Century Dictionary and Cyclopedia
    • micturate To pass urine; urinate.
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In literature:

They micturated independently but defecated simultaneously.
"Anomalies and Curiosities of Medicine" by George M. Gould
Take this to heart, ye children of Cain who eat doubloons and micturate water.
"Droll Stories, Complete" by Honore de Balzac