From Ancient Greek τρίγωνον (trígōnon, “triangle”), neuter substantive of τρίγωνος (trígōnos, “three-sided”), from τρεῖς (treîs, “three”) + γωνία (gōnía, “bend, angle”). Equivalent to tri- + -gon. Doublet of trigonon.
- (countable, geometry, rare) A triangle.
- (countable, historical, music) An ancient triangular harp of Oriental origin which had four strings and was often used for banquet music. Also called sabbeka, sackbut, sambuca.
- (countable, astrology) A division consisting of three signs.
- (countable, astrology) A trine; an aspect of two planets distant 120 degrees from each other.
- (Can we find and add a quotation of Hutton to this entry?)
- (uncountable, historical) An old ball game played by three people standing in a triangular formation.
- (countable, zoology) The cutting region of the crown of an upper molar, usually the anterior part.
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for trigon in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)
- Romanization of