enneagon

[ en-ee-uh-gon, -guhn ]

noun

1. nonagon.

enneagon

/ ˈɛnɪəɡən /

noun

1. another name for nonagon

Word History and Origins

Origin of enneagon¹

1650–60; < Greek enneágōnos; ennea-, -gon

Example Sentences

And in geometry, an enneagon or nonagon is a nine-sided shape.

From BBC