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1. The outer of the three germ layers of the embryo (the other two being mesoderm and endoderm) of a metozoan animal. Ectoderm gives rise to epidermis and neural tissue. (

2. One of the three primary germ cell layers in the very early embryo. The other two layers are the mesoderm (middle layer) and endoderm (most proximal layer), with the ectoderm as the most exterior (or distal) layer. It emerges first and forms from the outer layer of germ cells. (

3. The outer cellular membrane of a diploblastic animal (as a jellyfish). (Merriam –

adj., ectodermal

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