ectodermWiktionary 原文构词拆分ecto-前缀Outside. · (chiefly in fantasy fiction) Ghost-related.+-derm后缀skin or covering词源说明From ecto- + -derm.释义（英文）名词 Noun(biology) The outermost of the three tissue layers in the embryo of a metazoan animal, which produces through development, the epidermis (skin) and nervous system of the adult