having eight angles and eight sides.

Origin of octagonal

1565–75; octagon + -al1, replacing earlier octogonal < New Latin octōgōnālis, equivalent to octō- octo- + Greek gōn(ía) angle + -ālis -al1
Related formsoc·tag·o·nal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for octagonal


Examples from the Web for octagonal

Historical Examples of octagonal

  • Over the octagonal window, too, such draperies fell in stately lines.

    Within the Law

    Marvin Dana

  • He sprang to the octagonal window, even as Dick took possession of the pistol.

    Within the Law

    Marvin Dana

  • The drum dome is octagonal, with eight ribs and as many windows.

  • On the other sides of the octagonal pavilion the other assistants are busy "closing up."

    Against Odds

    Lawrence L. Lynch

  • They are all round, though one belongs to an octagonal shaft.

    Portuguese Architecture

    Walter Crum Watson

British Dictionary definitions for octagonal



having eight sides and eight angles
of or relating to an octagon
Derived Formsoctagonally, 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 octagonal

1570s, from octagon + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper

octagonal in Science



A polygon having eight sides.
Related formsoctagonal adjective (ŏk-tăgə-nəl)
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.