blastocyst blastocolla • blastocyte · · · Info · Definitions · Synonyms · Characters · · blastocyst · · Text Latin · · Script 10 · · Length 3 · · Syllables Definitions · · · (noun) the blastula of a placental mammal in which some differentiation of cells has occurred. Synonyms: blastodermic vessicle. · · Noun Definition 1 Synonyms · · · blastodermic vessicle · · Synonym 1 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 l latin small letter l U+006C o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079