a polygon having eight angles and eight sides.
Origin of octagon
< Latin octagōnon
< Greek oktágōnon,
noun use of neuter of oktágōnos
octangular; see octa-
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for octagon
Contemporary Examples of octagon
Historical Examples of octagon
It was in the shape of an octagon, and the turns were considered very safe.
In the application of the dome to the octagon no pendentives are employed.
The plan of the Octagon included in its area one bay on each of its four sides.
The stone-work of the Octagon must be completed by the restoration of the pinnacles and parapet.
The fourth large window in the Octagon has been filled with painted glass.
British Dictionary definitions for octagon
less commonly octangle
a polygon having eight sides
Word Origin for octagon
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
Word Origin and History for octagon
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
Related formsoctagonal adjective (ŏk-tăg′ə-nəl)
A polygon having eight sides.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.