Ectoderm n. : The outer layer of the blastoderm; epiblast.

Ectoderm n. : The external skin or outer layer of an animal or plant, this being formed in an animal from the epiblast. See Illust. of Blastoderm.

Example:
What does the Ectoderm produce very early in development?

Taxonomy
ectoderm, free encyclopedia, Germ layers, uterine decidua, search, Unsourced, embryonic disk, tissue, body surfaces, the nervous system, ovum, imbedded, Developmental biology, Week 1, Week 2, Week 3, Extraembryonic, Development of the urinary and reproductive organs.

Defination from the web:
Ectoderm. From Wikipedia, the free encyclopedia. Jump to: navigation, search. This article does not cite any references or sources. ... Generally speaking, the ectoderm differentiates to form the nervous system, and the epidermis (the outer part of integument) ...