单词	ectoderm
释义	ectoderm noun ec·​to·​derm ˈek-tə-ˌdərm  1 a : the outermost of the three primary germ layers of an embryo that is the source of various tissues and structures (such as the epidermis, the nervous system, and the eyes and ears) b : a tissue (such as neural tissue) derived from this germ layer 2 : the outer layer of cells of a diploblastic animal (such as a jellyfish or sponge) ectodermal ˌek-tə-ˈdər-məl  adjective Example Sentences Recent Examples on the Web There are a number of genetic disorders that can affect the ectoderm; this approach will not work across the board, experts say. Michael Nedelman, CNN, 18 May 2018 The outermost layer, the ectoderm, contributes to a number of structures including the skin, teeth, hair and sweat glands. Michael Nedelman, CNN, 18 May 2018 Word History Etymology International Scientific Vocabulary First Known Use 1859, in the meaning defined at sense 2 Medical Definition ectoderm noun ec·​to·​derm ˈek-tə-ˌdərm  1 : the outermost of the three primary germ layers of an embryo 2 : a tissue (as neural tissue) derived from ectoderm
随便看	give rise to give some slack give someone a bell give someone a break give someone a buzz give someone a call give someone a drubbing give someone a hard time give someone a leg up give someone a nod give someone a piece of one's mind give someone a ring give someone a roasting give someone a rollicking give someone a run for her money give someone a run for his money give someone a run for their money give someone a run for your money give someone a shout give someone a spanking give someone a tinkle give someone a wink give someone a yell give someone an eyeful give someone gyp

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