triangular

tri•an•gu•lar adj.

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.

tri•an•gu•lar•i•ty , n. tri•an ′gu•lar•ly, adv.

Collins Concise English Dictionary © HarperCollins Publishers::

triangular /traɪˈæŋɡjʊlə/ adj

Also: trigonal of, shaped like, or relating to a triangle; having three corners or sides
of or involving three participants, pieces, or units
having a base shaped like a triangle

tri•an•gle n. [countable]

Mathematicsa closed plane figure having three sides and three angles:an equilateral triangle.
a flat, three-sided piece of metal or plastic, with straight edges, used with a T square for drawing lines, etc.
any three-cornered or three-sided figure or piece:a triangle of land.
a delicate situation involving three persons, esp. one in which two of them are in love with the third.

tri•an•gu•lar adj.

tri•an•gle n.

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.
a situation involving three persons, esp. one in which two of them are in love with the third.
([cap.]) [Astron.]the constellation Triangulum.

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

tri ′an′gled, adj.

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