nonagon

[ non-uh-gon, -guhn ]

noun

1. a polygon having nine angles and nine sides.

nonagon

/ nɒnˈæɡənəl; ˈnɒnəˌɡɒn /

noun

1. a polygon having nine sides Also calledenneagon

Derived Forms

• nonagonal, adjective

Other Words From

• non·ag·o·nal [non-, ag, -, uh, -nl], adjective

Word History and Origins

Origin of nonagon¹

1680–90; < Latin nōn ( us ) ninth + -a- (extracted from pentagon, hexagon, etc.) + -gon

Example Sentences

And while the book is educational, technically, introducing kids to shapes from a simple square to a nonagon, the lesson is beside the point.

From New York Times

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

From BBC

Illustrations of the former are the bonds between cube root, hectare, brokerage, commission, indorsement, vertex, adjacent, nonagon, sector, draft, bill of exchange, and their meanings.

From Project Gutenberg