Definition of "urachus" [u•ra•chus]

• A band of fibrous tissue extending from the bladder to the umbilicus. (noun)

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• "The lowest part of the allantoic pedicle (or the "urachus") remains hollow, and forms the bladder."
• "It also has a narrow canal (the urachus) which serves to remove the urine of the foetus; in fact the subsequently formed bladder takes its origin from a dilation of the urachus."
• "In very rare cases open urachus may exist without any joint inflammation."