Definitions from Wiktionary (placoderm)

▸ noun:  (paleontology) A member of an extinct paraphyletic class (Placodermi) of jawed fish with armored heads and thoraces; the group lived during the Silurian and Devonian periods.
▸ adjective:  (paleontology) Pertaining to the paraphyletic class Placodermi.
▸ Also see placoderm


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