| 单词 | ostracoderm |
| 释义 | ostracoderm[ os-truh-koh-durm ] / ˈɒs trə koʊˌdɜrm / nounany of several extinct jawless fishes of the Ordovician, Silurian, and Devonian periods, having the body enclosed in an armor of bony plates. Origin of ostracoderm1890–95; <New Latin Ostracodermi, plural ofOstracodermus<Greek ostrakódermos with a shell, equivalent to óstrako(n) shell, tile + -dermos-derm Words nearby ostracodermOstpolitik, Ostpreussen, ostracism, ostracize, ostracod, ostracoderm, ostracon, ostrakon, ostranenie, Ostrava, ostrich Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for ostracodermostracoderm / (ˈɒstrəkəˌdɜːm, ɒsˈtrækə-) / nounany extinct Palaeozoic fishlike jawless vertebrate of the group Ostracodermi, characterized by a heavily armoured body Word Origin for ostracodermC19: via New Latin from Greek ostrakon shell + -derm Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for ostracodermostracoderm [ ŏs′trə-kŏ-dûrm′ ] Any of various extinct primitive jawless fishes of the Ordovician through the Devonian Period. Most ostracoderms had their heads or entire bodies encased in fused bony plates. Some or all ostracoderms are sometimes classified together with the modern cyclostomes (lampreys and hagfish). The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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