- The portion of the reduced allantoic stalk between the apex of the bladder and the umbilicus.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for urachus
He failed, however, to trace the connexion of the urachus with the bladder.