ectoderm noun. ['ɛktǝ(ʊ)dǝ:m] M19.
[from ECTO- + Greek derma skin.]
Biology. The outer germ layer of the embryo in early development, giving rise to epidermis and neural tissue; cells or tissue derived from this; such cells as forming the outer layer of the body of a coelenterate etc.

■ ectodermal adjective of, pertaining to, or derived from the ectoderm L19.

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