TRIANGLE • FREE-TRANSLATOR.COM • Definition of Triangle

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/trˈaɪˌæŋgəl/ Listen

noun

Triangle n.

1.

(Geom.) A figure bounded by three lines, and containing three angles. Note: 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.

(Mus.) 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.

(Mus.) 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.

(Astron.)

(a)

A small constellation situated between Aries and Andromeda.

(b)

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

Triangle spider (Zool.), 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 fiber. 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.

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Etymology of 'Triangle'

Collaborative International Dictionary of English 0.48

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"Triangle" Quotes from Famous Books

... was astonished soon after to realize that the triangle had become a hexagon, so to speak. Whitson and Nanette Erickson seemed to be much in each other's company. But, unlike Burleigh, Erickson seemed to be ...

— The Treasure-Train • Arthur B. Reeve

... were thick woods near by, and I hurried my party into them and gave men and horses a short rest till I could decide what to do. The Confederates were east of us, around Chancellorsville and in the triangle between the Rapidan and the Rappahannock, so that It was unsafe travelling in that direction. It's the business of an aide-de-camp carrying despatches to steal as quietly as possible through an enemy's country, and the one fatal thing is to be captured. ...

— The Militants - Stories of Some Parsons, Soldiers, and Other Fighters in the World • Mary Raymond Shipman Andrews

... a little later, to explain why the triangle tip of the arctic continent, which had begun to edge into sight on the screen globe, couldn't be seen from the ship. When he told her to go ahead, she got a platinum half-sol piece from her purse, held it on the globe from the classroom and ...

— Oomphel in the Sky • Henry Beam Piper

... through an opening of stormy sky lying between riven clouds. It was a gory sphere, a wafer of purple which lightened the immensity of the sea with a fiery glare. The dark masses closing in the horizon were fringed with scarlet. A restless triangle of flames spread over the dark green waters. The foam turned red and the coast looked for ...

— The Dead Command - From the Spanish Los Muertos Mandan • Vicente Blasco Ibanez

... whichever way you've a mind to look at it," Joel Quimber remarked meditatively. His eyes were cast up to the ceiling; his fore-fingers and thumbs formed an acute triangle over the bridge of his nose; the arms of his chair supported his elbows. "Queer thet it's allus them upper tens an' emigrants thet keep a-movin' on, fust one place then t'other. Kinder looks ez if, arter all, there warn't ...

— Flamsted quarries • Mary E. Waller

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