chorioallantoic membrane chorioallantoic • chorioallantoid · · · Info · Definitions · Synonyms · Characters · · chorioallantoic membrane · · Text Common · · Latin · · Scripts 24 · · Length 8 · · Syllables Definitions · · · (noun) the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois. Synonyms: chorioallantois, chorioallantoic membrane. · · Noun Definition 1 Synonyms · · · chorioallantois · · Synonym 1 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 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074