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triangle

[trahy-ang-guhl]

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noun

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.

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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.

COLLAPSE

Origin:
1350–1400; Middle English < Latin triangulum, noun use of neuter of triangulus three-cornered. See tri-, angle¹

Related forms

tri·an·gled, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To Triangle

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Triangle is always a great word to know.

So is red giant. Does it mean:

a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue

a theory that deduces a cataclysmic birth of the universe from the observed expansion of the universe, cosmic background radiation, abundance of the elements, and the laws of physics

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Example Sentences

Each is organized as a clear hierarchy rather than as a balanced triangle.

Instead of using three circles, the red light is now a triangle and the green light is a square.

His question coincided with my attempt to break the neatly formed triangle.

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Collins

World English Dictionary

triangle (ˈtraɪˌæŋɡ^əl)

—n
1.	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: ½ base × height
2.	any object shaped like a triangle
3.	See also eternal triangle any situation involving three parties or points of view
4.	music a percussion instrument consisting of a sonorous metal bar bent into a triangular shape, beaten with a metal stick
5.	a group of three

[C14: from Latin triangulum (noun), from triangulus (adjective), from tri- + angulus corner]

'triangled

—*adj*

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

triangle

late 14c., from O.Fr. triangle (13c.), from L. triangulum "triangle," from neut. of adj. triangulus "three-cornered," from tri- "three" + angulus "corner, angle." Triangulation is recorded from 1818.

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

COLLAPSE

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

triangle tri·an·gle (trī'āng'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.
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American Heritage

Science Dictionary

triangle

(trī'āng'gəl) Pronunciation Key
A closed geometric figure consisting of three sides.

American Heritage

Idioms & Phrases

triangle

see eternal triangle.