The Collaborative International Dictionary
Urachus
Urachus \U"ra*chus\, n. [NL., fr. Gr. ? urine + ? to hold.] (Anat.) A cord or band of fibrous tissue extending from the bladder to the umbilicus.
Wiktionary
urachus
n. (context anatomy English) A band of fibrous tissue extending from the bladder to the umbilicus.
Wikipedia
Urachus
The urachus is a fibrous remnant of the allantois, a canal that drains the urinary bladder of the fetus that joins and runs within the umbilical cord. The fibrous remnant lies in the space of Retzius, between the transversalis fascia anteriorly and the peritoneum posteriorly.
Usage examples of "urachus".
There is a case described of a man who evidently suffered from a patent urachus, as the urine passed in jets as if controlled by a sphincter from his umbilicus.