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ostracoderm: Meaning and Definition of
os•tra•co•derm
Pronunciation: (os'tru-kō-dûrm"), [key]
— n.
- any of several extinct jawless fishes of the Ordovician, Silurian, and Devonian periods, having the body enclosed in an armor of bony plates.
See also:
- ostracoderm (Thesaurus)
