Trigon

trī′gon, n. a three-cornered figure, a triangle—also Trigō′non : ( astrol. ) the junction of three signs, the zodiac being divided into four trigons—the first or watery trigon, Cancer, Scorpio, Pisces; the earthly , Taurus, Virgo, Capric or nus; the airy , Gemini, Libra, Aquarius; the fiery , Aries, Leo, Sag it tar i us.— adjs. Trig′onal , triangular in cro -section: three-angled, esp. in botany; Trigon′ic , pertaining to a trigon; Trig′onous , three-angled. [Gr. trigōnon — tri , tris , thrice, gōnia , an angle.]