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octagon

[ok-tuh-gon, -guh n] /ˈɒk təˌgɒn, -gən/
noun
1.
a polygon having eight angles and eight sides.
Also called octangle.
Origin of octagon
1650-1660
1650-60; < Latin octagōnon < Greek oktágōnon, noun use of neuter of oktágōnos octangular; see octa-, -gon
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for octagon

octagon

/ˈɒktəɡən/
noun
1.
a polygon having eight sides
Word Origin
C17: via Latin from Greek oktagōnos, having eight angles
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
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Word Origin and History for octagon
n.

1650s, from Latin octagonos, from Greek oktagononos, literally "eight-angled," from okta- comb. form of okto "eight" (see eight) + gonia "angle," related to gony "knee" (see knee (n.)). Also octogon (1650s), from French octogone.

Online Etymology Dictionary, © 2010 Douglas Harper
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octagon in Science
octagon
  (ŏk'tə-gŏn')   
A polygon having eight sides.

octagonal adjective (ŏk-tāg'ə-nəl)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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octagon in Culture

octagon definition


A polygon having eight sides.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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10
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