Etymology
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ectoderm (n.)

"outer layer of cells or outer membrane of a metazoan animal," 1853, from ecto- + -derm. Coined by Prussian embryologist Robert Remak (1815-1865). Related: Ectodermal.

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Definitions of ectoderm

ectoderm (n.)
the outer germ layer that develops into skin and nervous tissue;
Synonyms: exoderm / ectoblast
From wordnet.princeton.edu