Definition

A type of reptile that lived during the Permian and Triassic periods, which are believed to be direct ancestors of mammals.

Example

Therapsids were important in the evolution of mammals from reptiles.

Conversation

Have you ever heard of a therapsid?

No, I haven't. What is it?

It's a type of reptile from the Permian period that is linked to the ancestors of mammals.

That sounds fascinating! I love learning about ancient creatures.

Synonyms & Antonyms

Root Explanation

Therapsid → It is formed from 'thera-' (from Greek 'thēr', meaning beast or wild animal) and '-psid' (from Greek 'opsis', meaning appearance or form). The word 'therapsid' refers to a group of synapsid reptiles that have a beast-like appearance, particularly in their skull structure.

Memory Tip

Think of 'thēr' meaning beast, and 'opsis' meaning appearance — this helps you remember that a therapsid is a creature with a beast-like form.

Visually Confused Words