Search Result for "placoderm": 
Wordnet 3.0

NOUN (1)

1. fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws;


The Collaborative International Dictionary of English v.0.48:

Placoderm \Plac"o*derm\, n. [Gr. pla`x, plako`s, tablet + de`rma skin.] (Paleon.) One of the Placodermi. [1913 Webster]
WordNet (r) 3.0 (2006):

placoderm n 1: fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws