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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Plac·o·derm n.  Paleon. One of the Placodermi.
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From: WordNet (r) 2.0

 placoderm
      n : fishlike vertebrate with bony plates on head and upper body;
          dominant in seas and rivers during the Devonian;
          considered the earliest vertebrate with jaws