词根词缀：blasto-, blast-, -blast, -blastic

【来源及含义】Greek: germ, bud; shoot, formative cell or layer; of or pertaining to an embryonic or germinal stage of development

【同源单词】blast, blastema, blastocarpous, blastocyst, blastocyte, blastoderm

词根词缀：ecto-, ect-

【来源及含义】Greek: outside, external, beyond

【同源单词】ectobiology, ectoblast, ectocardia, ectocytic, ectoderm, ectodermal