TRIGONAL

rhombohedral, trigonal

(adjective) having threefold symmetry

Source: WordNet® 3.1

Etymology

Adjective

trigonal (comparative more trigonal, superlative most trigonal)

Triangular.

(crystallography) Of or pertaining to a crystal system with three equal and equally inclined but not perpendicular axes.

(anatomy) Relating to the trigone

Source: Wiktionary

Trig"o*nal, a.

Definition: Having three angles, or corners; triangular; as, a trigonal stem, one having tree prominent longitudinal angles.

Source: Webster’s Unabridged Dictionary 1913 Edition

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