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[trahy-ang-guh l] /ˈtraɪˌæŋ gəl/
a closed plane figure having three sides and three angles.
a flat triangular piece, usually of plastic, with straight edges, used in connection with a T square for drawing perpendicular lines, geometric figures, etc.
any three-cornered or three-sided figure, object, or piece:
a triangle of land.
a musical percussion instrument that consists of a steel triangle, open at one corner, that is struck with a steel rod.
a group of three; triad.
a situation involving three persons, especially one in which two of them are in love with the third.
(initial capital letter) Astronomy. the constellation Triangulum.
Origin of triangle
1350-1400; Middle English < Latin triangulum, noun use of neuter of triangulus three-cornered. See tri-, angle1
Related forms
triangled, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for triangle
  • Each is organized as a clear hierarchy rather than as a balanced triangle.
  • Between these two lines lies a large, fish-rich triangle.
  • Press down to create a pouch in the end of the plastic triangle.
  • The hypotenuse of a right triangle is not always the shortest distance between the two points that define it.
  • He or she will realize there's something to each of these sounds that's special, and it has to do with that triangle with legs.
  • Arrange the woody pieces in a triangle one stem to the right one to the left and one across then tuck in flowers.
  • Everyone probably already knows about the density triangle.
  • His question coincided with my attempt to break the neatly formed triangle.
  • Its the same formula as solving a triangle in geometry, but it would not yield the faster than c speed recorded for the neutrinos.
  • He raised his arms, forming two sides of a triangle.
British Dictionary definitions for triangle


(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: 1/2base × height
any object shaped like a triangle
any situation involving three parties or points of view See 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
triangled, adjective
Word Origin
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
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Word Origin and History for triangle

late 14c., from Old French triangle (13c.), from Latin triangulum "triangle," from neuter of adj. triangulus "three-cornered," from tri- "three" (see tri-) + angulus "corner, angle" (see angle (n.)).

In the huts of witches all the instruments and implements are triangular. ["Handwörterbuch des deutschen Aberglaubens"]

Online Etymology Dictionary, © 2010 Douglas Harper
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triangle in Medicine

triangle tri·an·gle (trī'āng'gəl)
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.
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triangle in Science
A closed geometric figure consisting of three sides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Idioms and Phrases with triangle


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