| trigon | | |
| n. (shape) | 1. triangle, trigon, trilateral | a three-sided polygon. |
| ~ polygon, polygonal shape | a closed plane figure bounded by straight sides. |
| ~ acute-angled triangle, acute triangle | a triangle whose interior angles are all acute. |
| ~ equiangular triangle, equilateral triangle | a three-sided regular polygon. |
| ~ isosceles triangle | a triangle with two equal sides. |
| ~ oblique triangle | a triangle that contains no right angle. |
| ~ obtuse-angled triangle, obtuse triangle | a triangle that contains an obtuse interior angle. |
| ~ right-angled triangle, right triangle | a triangle with one right angle. |
| ~ scalene triangle | a triangle with no two sides of equal length. |
| ~ cuneus, wedge, wedge shape | any shape that is triangular in cross section. |
| n. (group) | 2. trigon, triplicity | (astrology) one of four groups of the zodiac where each group consists of three signs separated from each other by 120 degrees. |
| ~ astrology, star divination | a pseudoscience claiming divination by the positions of the planets and sun and moon. |
| ~ triad, triple, triplet, trio | a set of three similar things considered as a unit. |
| n. (artifact) | 3. trigon | a triangular lyre of ancient Greece and Rome. |
| ~ lyre | a harp used by ancient Greeks for accompaniment. |
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