placoderm definition, placoderm meaning | English dictionary

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      n   any extinct bony-plated fishlike vertebrate of the class Placodermi, of Silurian to Permian times: thought to have been the earliest vertebrates with jaws  
     (C19: from Greek plac-, plax a flat plate + -derm)  
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See also:

placer, place, placoid, placeman

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