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triangle

[ trahy-ang-guhl ]
/ ˈtraɪˌæŋ gəl /
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noun
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Origin of triangle

First recorded in 1350–1400; Middle English, from Latin triangulum, noun use of neuter of triangulus “three-cornered”, see tri-, angle1

OTHER WORDS FROM triangle

triangled, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use triangle in a sentence

British Dictionary definitions for triangle

triangle
/ (ˈtraɪˌæŋɡəl) /

noun
geometry a three-sided polygon that can be classified by angle, as in an acute triangle, or by side, as in an equilateral triangle. Sum of interior angles: 180°; area: 1/2 base × height
any object shaped like a triangle
any situation involving three parties or points of viewSee also eternal triangle
music a percussion instrument consisting of a sonorous metal bar bent into a triangular shape, beaten with a metal stick
a group of three

Derived forms of triangle

triangled, adjective

Word Origin for triangle

C14: from Latin triangulum (noun), from triangulus (adjective), from tri- + angulus corner
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for triangle

triangle
[ trīăng′gəl ]

n.
A three-sided area, space, or structure.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for triangle

triangle
[ trīăng′gəl ]

A closed geometric figure consisting of three sides.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Other Idioms and Phrases with triangle

triangle

see eternal triangle.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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