- The passage from the pelvis of the kidney through the ureters, bladder, and urethra to the external urinary opening.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- The series of organs in the urinary system in which urine is formed and excreted. In most vertebrates, the urinary tract consists mainly of the kidneys, ureters, and bladder. In most mammals, and some fish and birds, the urinary tract also includes the urethra.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.