noun
ectoderm
Biology term for the outermost germ layer in embryonic development, giving rise to skin, nervous system, etc.
外胚葉からは表皮や神経系が形成される。
The epidermis and nervous system are formed from the ectoderm.
Compound of 外 (gai, 'outside') + 胚葉 (haiyō, 'germ layer'), a calque of the German Ektoderm or English ectoderm.