Placoderm :: Placoderm (n.) One of the Placodermi.

Placodermal :: Placodermal (a.) Of or pertaining to the placoderms; like the placoderms.

Placodermata :: Placodermata (n. pl.) Same as Placodermi.

Placodermi :: Placodermi (n. pl.) An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus..

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