[non-uh-gon, -guh n]
a polygon having nine angles and nine sides.
Origin of nonagon
Also called enneagon.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for nonagonninth
Examples from the Web for nonagon
Historical Examples of nonagon
There is said to be only one triangle, only one nonagon, and only one of diamond shape in all the forty thousand.One Irish Summer
William Eleroy Curtis
a polygon having nine sidesAlso called: enneagon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper