noun plac·o·derm \ˈpla-kə-ˌdərm\

Definition of placoderm

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

Origin and Etymology of placoderm

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

First Known Use: circa 1859

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