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-gon

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  1. a combining form meaning “angled,” “angular,” used in the formation of compound words: polygon; pentagon.
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Compare gonio-.

Origin of -gon

< Greek -gōnos, derivative of gōnía angle, akin to góny knee
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -gon

-gon

n combining form
  1. indicating a figure having a specified number of anglespentagon
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Word Origin

from Greek -gōnon, from gōnia angle
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