Medical Definition of ureter
: either of the paired ducts that carry away urine from a kidney to the bladder or cloaca and that in humans are slender membranous epithelium-lined flat tubes about sixteen inches (41 centimeters) long which open above into the pelvis of a kidney and below into the back part of the same side of the bladder at a very oblique angle
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Britannica.com: Encyclopedia article about ureter
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