ostracoderm

noun os·tra·co·derm \ˈäs-trə-kō-ˌdərm, äs-ˈtra-kə-\

Definition of OSTRACODERM

: any of the early fossil jawless fishes of the Lower Paleozoic usually having a bony covering of plates or scales

ultimately from Greek ostrakon + derma skin — more at derm-

First Known Use: 1891

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