trigon

A triangular lyre or harp of Roman and Greek antiquity.

A triangle.

The prominent anterior portion of an upper molar tooth forming a triangular area at whose angles are the three principal cusps —the protocone, paracone, and metacone. The study of the Mesozoic mammals has left no doubt that the upper and lower triangles, or ‘trigon’ and ‘trigonid,’ were derived from the reptilian protocone by the addition of lateral cusps. See cut under tooth, 1.

An abbreviation of trigonometrical; of trigonometry.

A trig; a skid.

A triangle.

In astrology: The junction of three signs, the zodiac being divided into four trigons: the watery trigon, which includes Cancer, Scorpio, and Pisces; the earthly trigon, Taurus, Virgo, and Capricornus; the airy trigon, Gemini, Libra, and Aquarius; and the fiery trigon, Aries, Leo, and Sagittarius.

Trine: an aspect of two planets distant 120 degrees from each other.

In antiquity: A kind of triangular lyre or harp. Also called trigonon.