: a percussion instrument consisting of a rod of steel bent into the form of a triangle open at one angle and sounded by striking with a small metal rod
b
: a drafting instrument consisting of a thin flat right-angled triangle of wood or plastic with acute angles of 45 degrees or of 30 degrees and 60 degrees
3
: a situation in which one member of a couple is involved in a love affair with a third person
Illustration of triangle
1 equilateral
2 acute
3 obtuse
4 scalene
5 isosceles
6 right triangle
Examples of triangle in a Sentence
She cut the sandwiches into triangles.
Recent Examples on the Web
Examples are automatically compiled from online sources to
show current usage.Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Marx becomes the third corner of their triangle, and decades of action ensue, much of it set in Los Angeles, some in the virtual realm, all of it riveting.—Literary Hub, 16 Oct. 2025 Two players go to the corners, and two go to the high posts, forming a mini-triangle with the point guard at the top of the key.—Bennett Durando, Denver Post, 15 Oct. 2025 Pedestrian improvements such as refuge islands, sidewalks, intersection simplifications and parking triangles.—Frederick Melo, Twin Cities, 15 Oct. 2025 And so Strong, who created TV series including Empire and Dopesick, rewrote the book to musical which follows two chess grandmasters, one American and one Soviet, during a chess tournament in the midst of the Cold War, and amid a love triangle.—Caitlin Huston, HollywoodReporter, 14 Oct. 2025 See All Example Sentences for triangle
Word History
Etymology
Middle English, from Anglo-French, from Latin triangulum, from neuter of triangulus triangular, from tri- + angulus angle
Share