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Dictionary

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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

ostracize

ostracon

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