nonagon

[non-uh-gon, -guhn]

noun

1. a polygon having nine angles and nine sides.

nonagon

/ nɒnˈæɡənəl, ˈnɒnəˌɡɒn /

noun

1. Also called: enneagon. a polygon having nine sides

Other Word Forms

• nonagonal 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.

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

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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.

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