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:
placoderm
Plural:
placoderms

Origin 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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