[ trig-uh-nl ]
See synonyms for trigonal on
  1. of, relating to, or shaped like a triangle; having three angles; triangular.

  2. Crystallography. having threefold symmetry.

Origin of trigonal

First recorded in 1560–70; trigon + -al1

Other words from trigonal

  • trig·o·nal·ly, adverb
  • sub·trig·o·nal, adjective

Words Nearby trigonal Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use trigonal in a sentence

British Dictionary definitions for trigonal


/ (ˈtrɪɡənəl) /

  1. another word for triangular (def. 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

Scientific definitions for trigonal


[ trī-gōnəl ]

  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.