Triangle

n. shape having three sides and three corners, three-sided polygon; group of three

A triangle is one of the basic shapes of geometry: a polygon with three corners or and three sides or edges which are straight line segments.In Euclidean geometry any three non-collinear points determine a triangle and a unique plane, i.e. two dimensional Cartesian space.
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Noun
1. a three-sided polygon
(synonym) trigon, trilateral
(hypernym) polygon, polygonal shape
(hyponym) acute triangle, acute-angled triangle
(derivation) triangulate
2. something approximating the shape of a triangle; "the coastline of Chile and Argentina and Brazil forms two legs of a triangle"
(hypernym) shape, form
3. any of various triangular drafting instruments used to draw straight lines at specified angles
(hypernym) drafting instrument
4. a percussion instrument consisting of a metal bar bent in the shape of an open triangle
(hypernym) percussion instrument, percussive instrument

n. triangle, shape having three sides and three corners, three-sided polygon

(n.)
An instrument of percussion, usually made of a rod of steel, bent into the form of a triangle, open at one angle, and sounded by being struck with a small metallic rod.
  

(n.)
A small constellation situated between Aries and Andromeda.
  

(n.)
A small constellation near the South Pole, containing three bright stars.
  

(n.)
A kind of frame formed of three poles stuck in the ground and united at the top, to which soldiers were bound when undergoing corporal punishment, -- now disused.
  

(n.)
A figure bounded by three lines, and containing three angles.
  

(n.)
A draughtsman's square in the form of a right-angled triangle.