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Dictionary

plac•o•derm

Pronunciation: (plak'u-dûrm"), [key]
—n.
any of various extinct jawed fishes of the class Placodermi, dominant in seas and rivers during the Devonian Period and characterized by bony armored plates on the head and upper trunk.

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

placode

placoid

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