Illustration of triangle
- 1 equilateral
- 2 acute
- 3 obtuse
- 4 scalene
- 5 isosceles
- 6 right triangle
triangle
noun
tri·an·gle
ˈtrī-ˌaŋ-gəl 
1
: a polygon having three sides compare spherical triangle
2
a
: 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
Examples of triangle in a Sentence
She cut the sandwiches into triangles.
Recent Examples on the Web
Dip fingertip into flour mixture, and moisten wrapper down the left side of the triangle.
—
Sabrina Weiss, People.com, 4 Nov. 2024
Jason Bateman and David Harbour will star in and executive produce a seven-episode series on HBO titled DTF St. Louis, the tale of a love triangle between three adults experiencing middle-age uneasiness that leads to one of them ending up dead.
—Marc Berman, Forbes, 2 Nov. 2024
There’s a friendship triangle taking shape, as Simone and Pita grow closer, shutting Gigi out.
—Doreen St. Félix, The New Yorker, 2 Nov. 2024
Francis Ford Coppola goes kinky gothic delicious for this classic tale of the Prince of Darkness/Jonathan Harker/Mina love triangle featuring Gary Oldman, Keanu Reeves, and Winona Ryder as its leads.
—Jordan Crucchiola, Vulture, 29 Oct. 2024
See all Example Sentences for triangle 
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Sabrina Weiss, People.com, 4 Nov. 2024
Jason Bateman and David Harbour will star in and executive produce a seven-episode series on HBO titled DTF St. Louis, the tale of a love triangle between three adults experiencing middle-age uneasiness that leads to one of them ending up dead.
—Marc Berman, Forbes, 2 Nov. 2024
There’s a friendship triangle taking shape, as Simone and Pita grow closer, shutting Gigi out.
—Doreen St. Félix, The New Yorker, 2 Nov. 2024
Francis Ford Coppola goes kinky gothic delicious for this classic tale of the Prince of Darkness/Jonathan Harker/Mina love triangle featuring Gary Oldman, Keanu Reeves, and Winona Ryder as its leads.
—Jordan Crucchiola, Vulture, 29 Oct. 2024
See all Example Sentences for triangle
Dictionary Entries Near triangle
Cite this Entry
“Triangle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triangle. Accessed 24 Nov. 2024.
Copy CitationKids Definition
triangle
noun
tri·an·gle
ˈtrī-ˌaŋ-gəl
1
: a figure that has three sides and three angles : a polygon that has three sides
2
: a percussion instrument made of a steel rod bent into a triangle open at one corner which is played by striking with a metal rod
3
: a drafting instrument consisting of a thin flat right-angled triangle
Medical Definition
triangle
noun
tri·an·gle
ˈtrī-ˌaŋ-gəl
: a three-sided region or space and especially an anatomical one see anterior triangle, carotid triangle, femoral triangle, posterior triangle, suboccipital triangle
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