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decagon

[dek-uh-gon, -guh n]
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noun Geometry.
  1. 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 formsde·cag·o·nal [duh-kag-uh-nl] /dəˈkæg ə nl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for decagon

Historical Examples

  • The plan of the church was a decagon, within which six composite columns in the centre supported six semi-circular vaults.

    Old and New London

    Walter Thornbury

  • Decagon, dek′a-gon, n. a plane figure of ten angles and sides.

  • In the fourth are six triangles, in the fifth, five polygons from a pentagon to a decagon.

    The Montessori Method

    Maria Montessori

  • Below the arches are the chapels which surround the decagon in symmetrical fashion.


British Dictionary definitions for decagon

decagon

noun
  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

n.

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

decagon

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

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