Placoderm

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Placoderm \Plac"o*derm\, n. [Gr. pla`x, plako`s, tablet + de`rma
     skin.] (Paleon.)
     One of the Placodermi.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:



  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