单词 | ostracoderm |
释义 | os·tra·co·derm (ŏstrə-kŏ-dûrm′) n. Any of various extinct primitive jawless fishes of the Ordovician through the Devonian periods, having bodies encased in an armor of bony plates. [Greek ostrakon, shell; see ost- in the Appendix of Indo-European roots + -DERM.] |
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