# placoderm

> English word · Noun

## Definitions
1. A member of an extinct paraphyletic class (Placodermi) of jawed fish with armored heads and thoraces; the group lived during the Silurian and Devonian periods.

## Etymology
From placo- + -derm, after German Placoderm.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/placoderm