1. A polygon or plane figure with nine sides or nine angles.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• wnneagon,
• snneagon,
• dnneagon,
• rnneagon,
• 4nneagon,
• 3nneagon,
• ebneagon,
• emneagon,
• ejneagon,
• ehneagon,
• enbeagon,
• enmeagon,
• ennegon,
• enneaon,
• Enneagone,
• Enneigone,
• Enneagong,
• Ennagone,
• Enneagian,
• Enneaqon

The plural of the "Enneagon" can be the "enneagons".

The singular of the "Enneagon" can be the "Enneagon".