chorioallantois chorioallantoid • choriocapillaris · · · Info · Definitions · Synonyms · Characters · · chorioallantois · · Text Latin · · Script 15 · · Length 5 · · Syllables Definitions · · · (noun) the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois. Synonyms: chorioallantoic membrane. · · Noun Definition 1 Synonyms · · · chorioallantoic membrane · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074