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octagonal

[ok-tag-uh-nl] /ɒkˈtæg ə nl/
adjective
1.
having eight angles and eight sides.
Origin of octagonal
1565-1575
1565-75; octagon + -al1, replacing earlier octogonal < New Latin octōgōnālis, equivalent to octō- octo- + Greek gōn(ía) angle + -ālis -al1
Related forms
octagonally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for octagonal
Historical Examples
  • And I went into the octagonal room, and sat down near the window and leaned my forehead against the glass.

    The Romance of His Life Mary Cholmondeley
  • Over the octagonal window, too, such draperies fell in stately lines.

    Within the Law Marvin Dana
  • The piers are octagonal, with many shafts, the capitals enriched with foliage of Early English type.

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

    Within the Law Marvin Dana
  • There are groining-shafts in the angles of the octagon, and an octagonal dome or vault, with ribs at the angles.

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

    Byzantine Churches in Constantinople Alexander Van Millingen
  • The font is octagonal, and has painted shields of arms in its upper panels.

  • It was octagonal in form, and was bordered all around with stone.

    Rollo in Paris Jacob Abbott
  • The descent to this low battery was by a slope ending in an octagonal hall whose vaults rested on four great cylindrical pillars.

    Annals of a Fortress E. Viollet-le-Duc
  • The octagonal story does not harmonize with the lower portion.

    Ely Cathedral Anonymous
British Dictionary definitions for octagonal

octagonal

/ɒkˈtæɡənəl/
adjective
1.
having eight sides and eight angles
2.
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
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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octagonal 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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