单词 | ostracoderm |
释义 | Word Frequency ostracoderm(ˈɒstrəkəˌdɜːm, ɒsˈtrækə-) noun any extinct Palaeozoic fishlike jawless vertebrate of the group Ostracodermi, characterized by a heavily armoured body Word origin C19: via New Latin from Greek ostrakon shell + -derm |
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