| triangle | | |
| 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. (shape) | 2. triangle | something approximating the shape of a triangle.; "the coastline of Chile and Argentina and Brazil forms two legs of a triangle" |
| ~ shape, form | the spatial arrangement of something as distinct from its substance.; "geometry is the mathematical science of shape" |
| n. (object) | 3. triangle, triangulum | a small northern constellation near Perseus between Andromeda and Aries. |
| ~ constellation | a configuration of stars as seen from the earth. |
| n. (artifact) | 4. triangle | any of various triangular drafting instruments used to draw straight lines at specified angles. |
| ~ drafting instrument | an instrument used by a draftsman in making drawings. |
| n. (artifact) | 5. triangle | a percussion instrument consisting of a metal bar bent in the shape of an open triangle. |
| ~ percussion instrument, percussive instrument | a musical instrument in which the sound is produced by one object striking another. |
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