Definitionen
1.NounA triangle.
2.NounAn ancient triangular harp of Oriental origin which had four strings and was often used for banquet music. Also called sabbeka, sackbut, sambuca.
3.NounA division consisting of three star signs."The Cancer trigon is composed of Cancer, Scorpio and Pisces"
4.NounA trine; an aspect of two planets distant 120 degrees from each other.
5.NounAn old ball game played by three people standing in a triangular formation. (See Wikipedia's entry for the game)
6.NounThe cusp (cutting region) of the crown of an upper molar, usually the anterior part.