triangular

[trahy-ang-gyuh-ler]
adjective
1.
pertaining to or having the form of a triangle; three-cornered.
2.
having a triangle as base or cross section: a triangular prism.
3.
comprising three parts or elements; triple.
4.
pertaining to or involving a group of three, as three persons, parties, or things.

Origin:
1535–45; < Latin triangulāris, equivalent to triangul(um) triangle + -āris -ar1

triangularity [trahy-ang-gyuh-lar-i-tee] , noun
triangularly, adverb
subtriangular, adjective
subtriangularity, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
triangular (traɪˈæŋɡjʊlə)
 
adj
1.  Also: trigonal of, shaped like, or relating to a triangle; having three corners or sides
2.  of or involving three participants, pieces, or units
3.  maths having a base shaped like a triangle
 
triangularity
 
n
 
triangularly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Imagine those three groups as the sides of a triangular-shaped basin.
Along top and bottom of single-leaf rows, cut out triangular notches and
  depress slightly.
The triangular shaped structures in the photo hold the heart to the mosquito's
  back.
They ran in a triangular formation with the pups in the middle.
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