Relating to both the genital and urinary systems together, especially in medical contexts.
Compound of 'genital' (from Latin 'genitus') and 'urinary' (from Latin 'urinarius'). This medical term was created because these two systems are closely connected anatomically and often treated together by doctors.
Doctors shortened this to 'GU' because 'genitourinary' is such a mouthful—it's a great example of how medical language creates these super-specific compound terms, then doctors just abbreviate them in their notes!
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