placoderm

noun
plac·​o·​derm | \ ˈpla-kə-ˌdərm How to pronounce placoderm (audio) \

Definition of placoderm

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

First Known Use of placoderm

circa 1859, in the meaning defined above

History and Etymology for placoderm

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

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The first known use of placoderm was circa 1859

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Britannica.com: Encyclopedia article about placoderm

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