| 单词 | ostracoderm |
| 释义 | ostracoderm /os"treuh koh derrm'/, n. any of several extinct jawless fishes of the Ordovician, Silurian, and Devonian periods, having the body enclosed in an armor of bony plates. [1890-95; < NL Ostracodermi, pl. of Ostracodermus < Gk ostrakódermos with a shell, equiv. to óstrako(n) shell, tile + -dermos -DERM] |
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