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trigonal

[trig-uh-nl] /ˈtrɪg ə nl/
adjective
1.
of, relating to, or shaped like a triangle; having three angles; triangular.
2.
Crystallography. having threefold symmetry.
Origin
1560-1570
1560-70; trigon + -al1
Related forms
trigonally, adverb
subtrigonal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for subtrigonal

trigonal

/ˈtrɪɡənəl/
adjective
1.
another word for triangular (sense 1)
2.
Also rhombohedral. relating or belonging to the crystal system characterized by three equal axes that are equally inclined and not perpendicular to each other
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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subtrigonal in Science
trigonal
  (trī-gō'nəl)   
Relating to a crystal having three axes of equal length intersecting at oblique angles. This crystal system is considered a subset of the hexagonal system. The mineral quartz has trigonal crystals. Also called rhombohedral. See illustration at crystal.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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