placoderm
plac·o·derm
noun \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
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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