trigonal
Americanadjective
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of, relating to, or shaped like a triangle; having three angles; triangular.
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Crystallography. having threefold symmetry.
adjective
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another word for triangular
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Also: rhombohedral. relating or belonging to the crystal system characterized by three equal axes that are equally inclined and not perpendicular to each other
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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.
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Also called rhombohedral
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See illustration at crystal
Other Word Forms
Etymology
Origin of trigonal
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
In typical alkenes, the carbons adopt a trigonal planar geometry, creating a flat structure around the double bond.
From Science Daily ● Jan. 23, 2026
They believed the reason trigonal chloride electrolytes can achieve low ionic conductivity is based on the variation of metal ion arrangements within the structure.
From Science Daily ● Nov. 2, 2023
Borate anions range from the simple trigonal planar ion to complex species containing chains and rings of three- and four-coordinated boron atoms.
From Textbooks ● Feb. 14, 2019
In both aldehydes and ketones, the geometry around the carbon atom in the carbonyl group is trigonal planar; the carbon atom exhibits sp2 hybridization.
From Textbooks ● Feb. 14, 2019
The horns are trigonal, laterally compressed and knotted on the upper edge.
From Natural History of the Mammalia of India and Ceylon by Robert Armitage Sterndale
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
