placoderm

Definitions

  • WordNet 3.6
    • n placoderm 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
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Webster's Revised Unabridged Dictionary
    • n Placoderm (Paleon) One of the Placodermi.
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Century Dictionary and Cyclopedia
    • placoderm Having the skin covered with broad flat plates, as a fish; belonging to the Placodermi.
    • n placoderm A ganoid fish of the group Placodermi.
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Chambers's Twentieth Century Dictionary
    • adj Placoderm plak′o-dėrm noting an order of fossil fishes having their skin covered with bony plates.
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Etymology

Webster's Revised Unabridged Dictionary
Gr. pla`x plako`s, tablet + de`rma skin
Chambers's Twentieth Century Dictionary
Gr. plax, plakos, anything flat, derma, skin.