| TRI | any of various triangular drafting instruments used to draw straight lines at specified angles |
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| TRI | a three-sided polygon |
| TRI | having three sides |
| TRI | involving three parties or elements |
| TRI | having three angles |
| TRI | bandage to support an injured forearm |
| TRI | a prism whose bases are triangles |
| TRI | the property of being shaped like a triangle |
| TRI | survey by triangulation |
| TRI | measure by using trigonometry |
| TRI | divide into triangles or give a triangular form to |
| TRI | composed of or marked with triangles |