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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

Examples of placoderm in a Sentence

Recent Examples on the Web

 From one layer to the next one above, no more trilobites or nightmarish placoderms or dimetrodons—entire animal reigns and ecosystems have vanished. — Manu Saadia, Ars Technica, "The Ends of the World is a page-turner about mass extinction," 4 Sep. 2017

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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