- 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
Historical Examples of urachus
He failed, however, to trace the connexion of the urachus with the bladder.