Search Result for "ostracoderm": 
Wordnet 3.0

NOUN (1)

1. extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic; 



The Collaborative International Dictionary of English v.0.48:

ostracoderm \ostracoderm\ n.
   Any of several extinct fishlike jawless vertebrates having a
   heavily armored body; of the Paleozoic.
   [WordNet 1.5]


WordNet (r) 3.0 (2006):

ostracoderm
    n 1: extinct fish-like jawless vertebrate having a heavily
         armored body; of the Paleozoic