Triangular. / (crystallography) Of or pertaining to a crystal system with three equal and equally inclined but not perpendicular axes. / (anatomy) Relating to the trigone

In a trigonal manner

(countable, geometry, rare) A triangle.

plural of trigon

(botany) One of the thickenings of the cell wall at the angles where several cells join.

plural of trigone

trigonal

(medicine) inflammation of the trigone region of the bladder

(rare) Relating to a trigon or triangle.

(zoology) Any wasp in the family Trigonalidae.