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[hek-sag-uh-nl] /hɛkˈsæg ə nl/
of, relating to, or having the form of a hexagon.
having a hexagon as a base or cross section:
a hexagonal prism.
divided into hexagons, as a surface.
Crystallography. noting or pertaining to a system of crystallization in which three equal axes intersect at angles of 60° on one plane, and the fourth axis, of a different length, intersects them perpendicularly.
Origin of hexagonal
1565-75; hexagon + -al1
Related forms
hexagonally, adverb
pseudohexagonal, adjective
pseudohexagonally, adverb
subhexagonal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hexagonal
  • The ceiling is coated with sparkling hexagonal ice crystals.
  • Imagine seven towers arranged in a hexagonal pattern,with the seventh at the centre.
  • Try comparing square designs to triangular or hexagonal designs.
  • The water molecules in ice are locked into a hexagonal crystal and do not move freely.
  • The rocks, hexagonal columns of basalt, formed millions of years ago from volcanoes in the area.
  • Six fingers, with three-joints each, extend from a hexagonal palm.
  • Neither for that matter are hexagonal or pyramid-shaped ones.
  • To form diamond, the hexagonal rings in graphite first have to deform.
  • There are essentially two ways a hexagonal ring can warp.
  • However, this slab is punctured by a hexagonal array of holes that correspond to the position of the polystyrene beads.
British Dictionary definitions for hexagonal


having six sides and six angles
of or relating to a hexagon
(crystallog) relating or belonging to the crystal system characterized by three equal coplanar axes inclined at 60° to each other and a fourth longer or shorter axis at right angles to their plane See also trigonal
Derived Forms
hexagonally, 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 hexagonal

1570s, from hexagon + -al (1). Related: Hexagonally.

Online Etymology Dictionary, © 2010 Douglas Harper
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hexagonal in Science
  1. Having six sides.

  2. Relating to a crystal having three axes of equal length intersecting at angles of 60° in one plane, and a fourth axis of a different length that is perpendicular to this plane. The mineral calcite has hexagonal crystals. See illustration at crystal.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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