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Meaning of ostracoderm

os•tra•co•derm

Pronunciation: (os'tru-kō-dûrm"), [key]
— n.
  1. any of several extinct jawless fishes of the Ordovician, Silurian, and Devonian periods, having the body enclosed in an armor of bony plates.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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