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单词	placoderm
释义	placoderm noun plac·​o·​derm ˈpla-kə-ˌdərm  : any of a class (Placodermi) of extinct chiefly Devonian fishes with an armor of bony plates and primitive jaw structures Example Sentences Recent Examples on the Web From one layer to the next one above, no more trilobites or nightmarish placoderms or dimetrodons—entire animal reigns and ecosystems have vanished. Manu Saadia, Ars Technica, 4 Sep. 2017 Word History Etymology New Latin Placodermi, ultimately from Greek plak-, plax + derma skin — more at derm- First Known Use circa 1859, in the meaning defined above
随便看	lineallest lineallier linealliest lineally lineament lineamental lineaments linear mean something to (someone) mean something to someone mean spheroid mean square mean square deviation mean streak mean sun mean the (whole) world mean the whole world mean the world mean the world to mean the world to (someone) mean the world to someone mean trick mean value mean value theorem mean well

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。