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Definitions:
Noun
placoderm
Definition: fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws
Definition: A member of an extinct class (Placodermi) of jawed fish with armored heads and thoraces; the group lived during the Silurian and Devonian periods.
Adjective
Definition: Pertaining to the class Placodermi.