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Definition of: ectoderm
(ek′tə·dûrm) noun Biol.
1. The outer layer of the integument of a multicellular organism.
2. The outer germ layer of the embryo, from which the epithelial structures of the surface of the body and the nervous system develop by the process of gastrulation: often called exoderm.
—ec′to·der′mal, ec′to·der′mic adjective
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