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...

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..

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.

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.

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