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[trahy-ang-gyuh-ler] /traɪˈæŋ gyə lər/
pertaining to or having the form of a triangle; three-cornered.
having a triangle as base or cross section:
a triangular prism.
comprising three parts or elements; triple.
pertaining to or involving a group of three, as three persons, parties, or things.
Origin of triangular
1535-45; < Latin triangulāris, equivalent to triangul(um) triangle + -āris -ar1
Related forms
[trahy-ang-gyuh-lar-i-tee] /traɪˌæŋ gyəˈlær ɪ ti/ (Show IPA),
triangularly, adverb
subtriangular, adjective
subtriangularity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for triangular
Contemporary Examples
Historical Examples
  • The lapels were, of course, soft-rolled and joined the collar with a triangular notch.

    Ruggles of Red Gap Harry Leon Wilson
  • Lay the slices one on the other, and cut in triangular shapes.

    The Skilful Cook Mary Harrison
  • Here is the famous "triangular bridge," a relic of the abbey.

  • Then we could find nothing by traveling toward the triangular cluster?

    Cogito, Ergo Sum John Foster West
  • You look over the whole town, which here appears in a triangular form.

    A Tour in Ireland Arthur Young
  • Carl laughed and pushed back the triangular lock of hair with the edge of his hat.

    O Pioneers! Willa Cather
  • Sicily, as will be seen by referring to the map, is of a triangular form.

    Pyrrhus Jacob Abbott
  • He had two triangular pieces of tile in his head instead of eyes.

    What the Moon Saw: and Other Tales Hans Christian Andersen
British Dictionary definitions for triangular


Also trigonal. of, shaped like, or relating to a triangle; having three corners or sides
of or involving three participants, pieces, or units
(maths) having a base shaped like a triangle
Derived Forms
triangularity (traɪˌæŋɡjʊˈlærɪtɪ) noun
triangularly, adverb
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 triangular

1540s, from Late Latin triangularis, from triangulum (see triangle).

Online Etymology Dictionary, © 2010 Douglas Harper
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