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
Dakota Johnson, Pedro Pascal and Chris Evans star in the film, and who doesn’t want to see what comes from that love triangle?
—
Meredith Blake, Los Angeles Times, 1 Jan. 2025
This year's Waterford Crystal ball is a geodesic sphere covered with 2,688 crystal triangles and measuring 12 feet in diameter.
—Saman Shafiq, USA TODAY, 31 Dec. 2024
The ball got aluminum skin, rhinestones, strobes, and computer controls in the late 1990s, and its now-signature crystal triangles (courtesy of Waterford Crystal) at the turn of the millennium.
—Rachel Treisman, NPR, 31 Dec. 2024
The Waterford Crystal ball is a geodesic sphere covered with 2,688 crystal triangles and measuring 12 feet in diameter.
—Alexis Simmerman, Austin American-Statesman, 31 Dec. 2024
See all Example Sentences for triangle 
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Meredith Blake, Los Angeles Times, 1 Jan. 2025
This year's Waterford Crystal ball is a geodesic sphere covered with 2,688 crystal triangles and measuring 12 feet in diameter.
—Saman Shafiq, USA TODAY, 31 Dec. 2024
The ball got aluminum skin, rhinestones, strobes, and computer controls in the late 1990s, and its now-signature crystal triangles (courtesy of Waterford Crystal) at the turn of the millennium.
—Rachel Treisman, NPR, 31 Dec. 2024
The Waterford Crystal ball is a geodesic sphere covered with 2,688 crystal triangles and measuring 12 feet in diameter.
—Alexis Simmerman, Austin American-Statesman, 31 Dec. 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 18 Jan. 2025.
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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