| 单词 | ostracoderm |
| 释义 | ostracoderm /osˈtrə-kə-dûrm/nounAny member (such as Cephalaspis) of a group of Silurian and Old Red Sandstone fishes or fish-like animals, generally cased in bony armour with undeveloped lower jaw, with flippers but not ordinary paired fins ORIGIN: Gr ostrakon shell, and derma skin |
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