ectoderm的音标：ectoderm的英式发音音标为：['ektəʊˌdɜ:m]ectoderm的美式发音音标为：['ektəˌdɜm]...

n.外胚层...

The outer layer of a blastula that gives rise to the ectoderm after gastrulation.外胚层囊胚的外层,在原肠胚形成之后生后外胚层组织....