[dek-uh-gon, -guh n]
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Origin of decagon

From the Medieval Latin word decagōnum, dating back to 1565–75. See deca-, -gon
Related formsde·cag·o·nal [duh-kag-uh-nl] /dəˈkæg ə nl/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for decagon

Historical Examples of decagon

British Dictionary definitions for decagon


  1. a polygon having ten sides
Derived Formsdecagonal (dɪˈkæɡənəl), adjectivedecagonally, adverb
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

Word Origin and History for decagon

early 17c., from Modern Latin decagonum, from Greek dekagonon, from deka "ten" (see ten) + gonia "corner, angle" (see knee (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper

decagon in Science


  1. A polygon having ten sides.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.