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ostracoderm

One entry found for ostracoderm.
Main Entry: os·tra·co·derm
Pronunciation: 'äs-tr&-kO-"d&rm, äs-'tra-k&-
Function: noun
Etymology: ultimately from Greek ostrakon + derma skin -- more at DERM-
: any of the early fossil jawless fishes of the Lower Paleozoic usually having a bony covering of plates or scales