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1. (n.) placoderm
any of various extinct jawed fishes of the class Placodermi, chiefly of the Devonian Period: many were armored in bony plates.
Etymology: (1855–60; < NL Placodermi name of the class, pl. of placodermus=placo- (< Gk; see placoid , -o -) +-dermus -derm)
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| Definition of 'placoderm' |
Princeton's WordNet |
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1. (noun) placoderm
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
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| Definition of 'placoderm' |
Webster Dictionary |
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1. (noun) placoderm
one of the Placodermi
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Definitions of placoderm 
