trigon /trīˈgon/

1. A triangle
2. (in ancient Greece or Rome) a type of lyre or harp
3. A set of three signs 120º apart, the zodiac being divided into four trigons, watery (consisting of Cancer, Scorpio and Pisces), earthly (Taurus, Virgo and Capricorn), airy (Gemini, Libra and Aquarius) and fiery (Aries, Leo and Sagittarius; astrology)

trigonal /trigˈə-nl/ adjective

1. Of a trigon
2. Triangular
3. Trigonous
4. Bounded by three planes
5. (of symmetry about an axis) such that a rotation through 120º gives the same figure

trigˈonally adverb

trigonic /trī-gonˈik/ adjective

1. Of a trigon
2. Triangular

trigonous /trigˈə-nəs/ adjective (esp botany)

Triangular in section, or nearly so

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