tri·an·gu·lar

[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

tri·an·gu·lar·i·ty [trahy-ang-gyuh-lar-i-tee] , noun
tri·an·gu·lar·ly, adverb
sub·tri·an·gu·lar, adjective
sub·tri·an·gu·lar·i·ty, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To triangular
00:10
Triangular is always a great word to know.
So is flibbertigibbet. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
triangular (traɪˈæŋɡjʊlə) [Click for IPA pronunciation guide]
 
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
He tore the seam open, spread the fabric to form a triangular bowl, and watched
  happily as the rain pooled on the fabric.
In reality, ancient cultures on nearly every continent erected the triangular
  monuments at one point or another.
They ran in a triangular formation with the pups in the middle.
One pizza parlor now serves triangular pies on triangular platters.
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