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Pronunciation: yūr′ă-kŭs
Definition: That part of the allantois between the apex of the bladder and the umbilicus; postnatally, the urachus is normally merely a fibrous cord, the median umbilical ligament, but occasionally the allantoic lumen may persist as a urachal fistula.
[G. ourachos, the urinary canal of a fetus]
Examples: glitazone, GI cocktail, etc.
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