Definitions for: Placoderm

[n] fishlike vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws

Webster (1913) Definition: Plac"o*derm, n. [Gr. ?, ?, tablet + ? skin.]
(Paleon.)
One of the Placodermi.

See Also: aquatic vertebrate, class Placodermi, Placodermi