'Placodermi' definitions:
Definition of 'Placodermi'
From: WordNet
noun
Extinct group of bony-plated fishes with primitive jaws [syn: Placodermi, class Placodermi]
Definition of 'Placodermi'
From: GCIDE
- Placodermi \Plac`o*der"mi\, n. pl. [NL., fr. Gr. pla`x, plako`s, a tablet + de`rma skin.] (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. [1913 Webster]