mesoderm mesode • mesodermal · · · Info · Definitions · Synonyms · Characters · · mesoderm · · Text Latin · · Script 8 · · Length Definitions · · · (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue. Synonyms: mesoblast. · · Noun Definition 1 Synonyms · · · mesoblast · · Synonym 1 Characters · · d latin small letter d U+0064 e latin small letter e U+0065 m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073