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The Adobe Flash Player is required in order to view this content. You can get it here: ostracodermOne entry found. Main Entry: os·tra·co·derm Pronunciation: \ˈäs-trə-kō-ˌdərm, äs-ˈtra-kə-\ Function: noun Etymology: ultimately from Greek ostrakon + derma skin — more at derm- Date: 1891 : any of the early fossil jawless fishes of the Lower Paleozoic usually having a bony covering of plates or scales 
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