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[ok-tag-uh-nl] /ɒkˈtæg ə nl/
having eight angles and eight sides.
Origin of octagonal
1565-75; octagon + -al, replacing earlier octogonal < New Latin octōgōnālis, equivalent to octō- octo- + Greek gōn(ía) angle + -ālis -al1
Related forms
octagonally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for octagonal
  • He had returned to the comfort of this glamorous gym carpeted in a red-green-and-beige octagonal design.
  • These novel crayons aren't really round-they are more octagonal, so they don't roll away as easily.
  • It is not a large building but exquisitely beautiful, with a distinctive octagonal tower.
  • The octagonal central chamber contains the cenotaph with diagonal sides leading to the corner-chambers.
  • The lighthouse and attached brick keeper's house sit on an octagonal pier in the water.
  • Its offerings are freshly prepared at an octagonal chef's station in the middle of the room.
  • octagonal guest villas are set within the gardens, facing the sea.
  • It is a vision of shimmering cream and white island architecture with bay windows, octagonal decks and gazebos.
  • He suddenly remembered the octagonal, green-and- cream pattern of the linoleum floor, dotted with hair clippings.
  • Then you would step down into a large octagonal room dominated by a central column.
British Dictionary definitions for octagonal


having eight sides and eight angles
of or relating to an octagon
Derived Forms
octagonally, 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
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Word Origin and History for octagonal

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

Online Etymology Dictionary, © 2010 Douglas Harper
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octagonal in Science
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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