trigonal

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tri·go·nal

 (trī-gō′nəl)
adj. Mineralogy
Rhombohedral.

[Earlier, relating to a trigon or triplicity, relating to three angles : Latin trigōnum, triangle; see trigon + -al.]

trigonal

(ˈtrɪɡənəl)
adj
1. (Mathematics) another word for triangular1
2. (Chemistry) Also: rhombohedral relating or belonging to the crystal system characterized by three equal axes that are equally inclined and not perpendicular to each other

trig•o•nal

(ˈtrɪg ə nl)

adj.
1. of, pertaining to, or shaped like a triangle; having three angles; triangular.
2. (of a crystal) having threefold symmetry.
[1560–70]
trig′o•nal•ly, adv.

tri·go·nal

(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 more at crystal.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.trigonal - having threefold symmetry
crystallography - the branch of science that studies the formation and structure of crystals
symmetric, symmetrical - having similarity in size, shape, and relative position of corresponding parts