noun a kind of triangular lyre or harp.
2. trigon ·noun a division consisting of three signs.
3. trigon ·noun a figure having three angles; a triangle.
4. trigon ·noun trine, an aspect of two planets distant 120 degrees from each other.
5. trigon ·noun a kind of game at ball played by three persons standing at the angular points of a triangle.
6. trigon ·add. ·noun the cutting region of the crown of an upper molar, usually the anterior part. that of a lower molar is the tri"go*nid (/).