Hypertext Webster Gateway: "trigonal"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Trigonal \Trig"o*nal\, a.
Having three angles, or corners; triangular; as, a trigonal
stem, one having tree prominent longitudinal angles.
From WordNet (r) 1.7 (wn)
trigonal
adj : (crystallography) having three-fold symmetry [syn: {rhombohedral}]
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