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

New Latin Placodermi, ultimately from GK plak-, plax + derma skin — more at derm-

First Known Use: circa 1865

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