Placoderm Definition
 plăkə-dûrm 
    noun
  
 Any of various extinct jawed fishes of the group Placodermi of the Silurian and Devonian Periods, having bony plates of armor covering the head and thorax. Placoderms were among the first jawed vertebrates.
 American Heritage 
Other Word Forms of Placoderm
Noun
Singular:
 placodermPlural:
 placodermsOrigin of Placoderm
-  New Latin Placodermī class name Greek plax plak- flat stone, plate plāk-1 in Indo-European roots –derm From American Heritage Dictionary of the English Language, 5th Edition 
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