Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of placoderm is as below...

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

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

Pterichthys :: Pterichthys (n.) A genus of Devonian fossil fishes with winglike appendages. The head and most of the body were covered with large bony plates. See Placodermi.

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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