Definition

An extinct type of fish that lived during the Silurian and Devonian periods, known for having bony plates that protected its head and sides, as well as having jaws and fins.

Example

Scientists have discovered fossils of placoderms that show their unique armored bodies.

Conversation

Have you ever heard of a placoderm?

No, what’s that?

It's an extinct fish that had bony plates on its head.

That's interesting! I love learning about ancient creatures.

Synonyms & Antonyms

Root Explanation

Placoderm → It is formed from "plako-" (from Greek "plakos", meaning flat or plate) and "derm" (from Greek "derma", meaning skin). The word "placoderm" refers to fish with flat, plate-like skin or armor.

Memory Tip

Think of 'flat' ('plako-') skin ('derm') to remember that a placoderm is a type of fish with flat, plate-like skin.

Visually Confused Words