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triangle

[trahy-ang-guh l] /ˈtraɪˌæŋ gəl/
noun
1.
a closed plane figure having three sides and three angles.
2.
a flat triangular piece, usually of plastic, with straight edges, used in connection with a T square for drawing perpendicular lines, geometric figures, etc.
3.
any three-cornered or three-sided figure, object, or piece:
a triangle of land.
4.
a musical percussion instrument that consists of a steel triangle, open at one corner, that is struck with a steel rod.
5.
a group of three; triad.
6.
a situation involving three persons, especially one in which two of them are in love with the third.
7.
(initial capital letter) Astronomy. the constellation Triangulum.
Origin
1350-1400
1350-1400; Middle English < Latin triangulum, noun use of neuter of triangulus three-cornered. See tri-, angle1
Related forms
triangled, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for triangled

triangle

/ˈtraɪˌæŋɡəl/
noun
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: 1/2base × height
2.
any object shaped like a triangle
3.
any situation involving three parties or points of view See also eternal triangle
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
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 triangled

triangle

n.

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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triangled in Medicine

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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triangled in Science
triangle
  (trī'āng'gəl)   
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 triangled

triangle

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