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A Writer's Dictionary:

placoderm Definition


Dictionary Home » Words Starting with P » placental ... plano-concave » placoderm


placoderm
adj
    1. Said of some fossil fishes: covered with bony plates.
noun
    1. A fish covered in this way.
    2. A class of aquatic chordates of the Devonian period, which are vertebrates with armour formed of skin plates.
Etymology: 19c: from Greek plax, plakos anything flat + derma skin.



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