Definition of placoderm
: any of a class (Placodermi) of extinct chiefly Devonian fishes with an armor of bony plates and primitive jaw structures
Origin of placoderm
New Latin Placodermi, ultimately from GK plak-, plax + derma skin — more at derm-
First Known Use: circa 1865
Learn More about placoderm
Britannica.com: Encyclopedia article about "placoderm"
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