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placodermOne entry found. Main Entry: plac·o·derm Pronunciation: \ˈpla-kə-ˌdərm\ Function: noun Etymology: New Latin Placodermi, ultimately from GK plak-, plax + derma skin — more at derm- Date: circa 1865 : any of a class (Placodermi) of extinct chiefly Devonian fishes with an armor of bony plates and primitive jaw structures
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