placodermi Meaning, Definition & Usage

  1. noun extinct group of bony-plated fishes with primitive jaws
    class Placodermi.

WordNet

Plac`o*der"mi noun plural
Etymology
NL., fr. Gr. , , a tablet + skin.
Definitions
  1. (Paleon.) 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.

Webster 1913