vesicula umbilicus vesiculation • vesicule · · · Info · Definitions · Synonyms · Characters · · vesicula umbilicus · · Text Common · · Latin · · Scripts 18 · · Length 8 · · Syllables Definitions · · · (noun) membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional. Synonyms: yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus. · · Noun Definition 1 Synonyms · · · yolk sac · · Synonym 1 vitelline sac · · Synonym 2 umbilical vesicle · · Synonym 3 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D s latin small letter s U+0073 u latin small letter u U+0075 v latin small letter v U+0076