'Trigonal' definitions:
Definition of 'trigonal'
From: WordNet
adjective
Having threefold symmetry [syn: rhombohedral, trigonal]
Definition of 'Trigonal'
From: GCIDE
- Trigonid \Tri"go*nid\ [Webster 1913 Suppl.] Trigonal \Trig"o*nal\, a. Having three angles, or corners; triangular; as, a trigonal stem, one having tree prominent longitudinal angles. [1913 Webster] [1913 Webster]