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ostracoderm

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WordReference Random House Unabridged Dictionary of American English © 2025

os•tra•co•derm n.

Paleontologyany of several extinct jawless fishes of the Ordovician, Silurian, and Devonian periods, having the body enclosed in an armor of bony plates.

Greek ostrakódermos with a shell, equivalent. to óstrako(n) shell, tile + -dermos -derm
Neo-Latin Ostracodermi, plural ofOstracodermus
1890–95

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