What does "trigonal" mean?

Having three angles and three sides, triangular.

Trigonal

Common synonyms include: crystal system, cuneiform, deltoid, rhombohedral, three dimensional, three-coordinate geometry.

/ˈtrɪɡənəl/ adj

adj ·Rare ·Advanced level

Adjective

1
Having three angles and three sides, triangular.
2
Of or pertaining to a crystal system with three equal and equally inclined but not perpendicular axes.
3
Relating to the trigone

Adjective

From Latin trigōnālis (“triangular”), equivalent to trigon + -al.