plural triangles
1
: a shape that is made up of three lines and three angles
2
: something that is shaped like a triangle
She cut the sandwiches into triangles.
a triangle of land
3
: a musical instrument that is made of a steel rod bent into the shape of a triangle and that you play by hitting with a metal rod
4
: a situation in which one member of a couple is involved in a romantic or sexual relationship with another person
a love triangle
5
US
: a usually plastic or metal device that is shaped like a triangle and used for drawing straight lines and angles
called also (British) set square
Cite this Entry
“Triangle.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/triangle. Accessed 23 Jun. 2026.
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