of, pertaining to, or shaped like a triangle; having three angles; triangular.
Crystallography. having threefold symmetry.

1560–70; trigon + -al1

trigonally, adverb
subtrigonal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trigonal (ˈtrɪɡənəl)
1.  another word for triangular
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 10th Edition
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American Heritage
Science Dictionary
trigonal   (trī-gō'nəl)  Pronunciation Key 
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
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