| Title | ectoderm |
|---|---|
| Text |
Merriam-Webster's Collegiate Dictionary ec·to·derm ETYMOLOGY International Scientific Vocabulary DATE 1859 1. the outer cellular membrane of a diploblastic animal (as a jellyfish) 2. a. the outermost of the three primary germ layers of an embryo that is the source of various tissues and structures (as the epidermis, the nervous system, and the eyes and ears) b. a tissue (as neural tissue) derived from this germ layer English Etymology ectoderm 1861, from ecto- + derm. Webster's Third New International Dictionary, Unabridged ec·to·derm \-təˌdərm\ noun (-s) Etymology: International Scientific Vocabulary ect- + -derm 1. : the outer cellular membrane of a medusa or other diploblastic animal 2. : the outermost of the three primary germ layers of an embryo :the source of neural tissue and sense organs, of the outer layer of the skin, and of minor adult structures : epiblast ; also : any tissue wherever located derived from this germ layer — compare epidermis • ec·to·der·mal \| ̷ ̷ ̷ ̷|dərməl\ or ec·to·der·mic \-mik\ adjective |
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