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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A continuous anatomical tract, including the kidneys, ureters, and urethra, involved in the formation and excretion of urine.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the continuous system involved in the production and excretion of urine; the kidneys, ureters, urinary bladder and urethra

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the organs and tubes involved in the production and excretion of urine


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