Dictionary

placoderm

noun plac·o·derm \ˈpla-kə-ˌdərm\

Definition of PLACODERM

:  any of a class (Placodermi) of extinct chiefly Devonian fishes with an armor of bony plates and primitive jaw structures
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Origin of PLACODERM

New Latin Placodermi, ultimately from GK plak-, plax + derma skin — more at derm-
First Known Use: circa 1865

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