外胚层 Traditional 外胚層 wài pēi céng 🔊 ectoderm (cell lineage in embryology) + Keep this word Meanings wài pēi céng 外胚層 ectoderm (cell lineage in embryology) Its characters 外wàioutsideHSK 1胚pēiembryo层céngto pile on top of one anotherHSK 3