nonagon

Example Sentences

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

From BBC • Aug. 23, 2017

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 The Psychology of Arithmetic by Thorndike, Edward L. (Edward Lee)