[ dek-uh-gon, -guh n ]
/ ˈdɛk əˌgɒn, -gən /

noun Geometry.

a polygon having ten angles and ten sides.

Origin of decagon

From the Medieval Latin word decagōnum, dating back to 1565–75. See deca-, -gon

Related forms

de·cag·o·nal [duh-kag-uh-nl] /dəˈkæg ə nl/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for decagon

British Dictionary definitions for decagon


/ (ˈdɛkəˌɡɒn) /


a polygon having ten sides

Derived Forms

decagonal (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

Science definitions for decagon


[ dĕkə-gŏn′ ]

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