mesoblast mesobenthos • mesoblastema · · · Info · Definitions · Synonyms · Characters · · mesoblast · · Text Latin · · Script 9 · · Length Definitions · · · (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue. Synonyms: mesoderm. · · Noun Definition 1 Synonyms · · · mesoderm · · Synonym 1 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 l latin small letter l U+006C m latin small letter m U+006D o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074