Webster’s Revised Unabridged Dictionary · 1913
Trigonal
Trig′o·nal (trĭg′ō·nal), a. Having three angles, or corners; triangular; as, a trigonal stem, one having tree prominent longitudinal angles.
Webster’s Revised Unabridged Dictionary · 1913
Trig′o·nal (trĭg′ō·nal), a. Having three angles, or corners; triangular; as, a trigonal stem, one having tree prominent longitudinal angles.