Definition

A shape that has nine straight sides and nine angles.

Example

The artist drew an enneagon as part of her geometric artwork.

Conversation

Did you know that a polygon with nine sides is called an enneagon?

Really? I had no idea there was a special name for that.

Yeah, it's pretty interesting how many different shapes have unique names.

Totally! I love learning about geometry like that.

Synonyms & Antonyms

Root Explanation

Enneagon is formed from "ennea" (from Greek ἐννέα, meaning nine) and "gonia" (from Greek γωνία, meaning angle). The word refers to a polygon with nine angles and nine sides.

Memory Tip

Think of 'ennea' meaning nine and 'gonia' meaning angle — so an enneagon is a shape with nine angles.

Visually Confused Words