内胚层 Traditional form: 內胚層 Pinyin (reading): nèipēicéng Definitions: endoderm (cell lineage in embryology) Characters: 内 - inside 胚 - embryo; an unfinished thing 层 - layer, floor, story, stratum Traditional characters: 內 - inside 胚 - embryo; an unfinished thing 層 - layer, floor, story, stratum