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Definition of Urinary tract infection
1. Noun. Any infection of any of the organs of the urinary tract.
Medical Definition of Urinary tract infection
1. A bacterial infection of the urethra, bladder, ureters or kidneys (part of the urinary tract). Common symptoms of a urinary tract infection include pain with urination, urinary urgency and increased frequency of urination. Acronym: UTI (15 Nov 1997)