Definition of Triangle

1. Noun. A three-sided polygon.

2. Noun. Something approximating the shape of a triangle. "The coastline of Chile and Argentina and Brazil forms two legs of a triangle"
Generic synonyms: Form, Shape

3. Noun. A small northern constellation near Perseus between Andromeda and Aries.
Exact synonyms: Triangulum
Generic synonyms: Constellation

4. Noun. Any of various triangular drafting instruments used to draw straight lines at specified angles.
Generic synonyms: Drafting Instrument

5. Noun. A percussion instrument consisting of a metal bar bent in the shape of an open triangle.

Definition of Triangle

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

Definition of Triangle

1. Proper noun. The area comprising the cities of Raleigh, Durham and Chapel Hill in North Carolina. Used with "the" except when attributive. ¹

2. Noun. (geometry) A polygon with three sides and three angles. ¹

3. Noun. (music) A percussion instrument made by forming a metal rod into a triangular shape which is open at one angle. It is suspended from a string and hit with a metal bar to make a resonant sound. ¹

4. Noun. (context: cue sports) A triangular shaped piece of equipment used for gathering the balls into the formation required by the game being played. ¹

5. Noun. A love triangle. ¹

6. Noun. (context: systemics) The structure of systems composed with three interrelated objects. ¹

¹ Source:

Definition of Triangle

1. a polygon having three sides [n -S]

Medical Definition of Triangle

1. 1. A figure bounded by three lines, and containing three angles. A triangle is either plane, spherical, or curvilinear, according as its sides are straight lines, or arcs of great circles of a sphere, or any curved lines whatever. A plane triangle is designated as scalene, isosceles, or equilateral, according as it has no two sides equal, two sides equal, or all sides equal; and also as right-angled, or oblique-angled, according as it has one right angle, or none; and oblique-angled triangle is either acute-angled, or obtuse-angled, according as all the angles are acute, or one of them obtuse. The terms scalene, isosceles, equilateral, right-angled, acute-angled, and obtuse-angled, are applied to spherical triangles in the same sense as to plane triangles. 2. 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. 3. A draughtsman's square in the form of a right-angled triangle. 4. 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. 5. A small constellation situated between Aries and Andromeda. A small constellation near the South Pole, containing three bright stars. Triangle spider, a small American spider (Hyptiotes Americanus) of the family Ciniflonidae, living among the dead branches of evergreen trees. It constructs a triangular web, or net, usually composed of four radii crossed by a double elastic fibre. The spider holds the thread at the apex of the web and stretches it tight, but lets go and springs the net when an insect comes in contact with it. Origin: L. Triangulum, fr. Triangulus triangular; tri- (see Tri-) + angulus angle: cf. F. Triangle. See Angle a corner. Source: Websters Dictionary (01 Mar 1998)

Triangle Pictures

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Lexicographical Neighbors of Triangle

triamcinolone acetonide
triamcinolone diacetate
triangle (current term)
triangle bandage
triangle inequality
triangle of auscultation
triangle of elbow
triangle of fillet
triangle of safety
triangle of vertebral artery
triangle test

Literary usage of Triangle

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Treatise on Conic Sections: Containing an Account of Some of the Most by George Salmon (1879)
"Let the point in which meet the lines joining the corresponding vertices of any triangle and of its polar triangle with respect to a conic be called the ..."

2. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, Literature and (1911)
"In a plane triangle any one of the angular points can be regarded as the ... The three sides and angles constitute the six elements of a triangle; ..."

3. South Eastern Reporter by West Virginia Supreme Court of Appeals, West Publishing Company, South Carolina Supreme Court (1913)
"P. Clarence Barnes was the owner of an adjoining tract, which terminated in a sharp triangle having its apex at the corner common to the two Bent tracts. ..."

4. Elements of Geometry: Containing the First Six Books of Euclid, with a by John Playfair, William Wallace (1836)
"5- the triangle FGL, sof is the triangle BEC to the triangle GLH. Again, because the triangle EBC is similar to the triangle LGH, EBC has to LGH the ..."

5. Anatomy: Descriptive and Surgical by Henry Gray, Thomas Pickering Pick (1897)
"SURGICAL ANATOMY OF THE triangle* OF THE NECK. The student having considered the relative anatomy of the large arteries of the neck and their branches, ..."

6. Catalogue of Scientific Papers, 1800-1900: Subject Indexby Royal Society (Great Britain), Herbert McLeod by Royal Society (Great Britain), Herbert McLeod (1908)
"of triangle formed by joining feet of bisectors of angles. Dostor, G. Arch. Mth. Ps. 64 ... circles of plane triangle generalised, inversion of system. ..."

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