TRIANGLE • E-FREE TRANSLATION.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

... of objects and the prodigious variety of scenes. This continent is divided, almost equally, into two vast regions, one of which is bounded on the north by the Arctic Pole, and by the two great oceans on the east and west. It stretches towards the south, forming a triangle whose irregular sides meet at length below the great lakes of Canada. The second region begins where the other terminates, and includes all the remainder of the continent. The one slopes gently towards the Pole, the other towards ...

— Democracy In America, Volume 1 (of 2) • Alexis de Tocqueville

... it with these three pieces of stone. Quick!" Vic swept both arms about Hope and me, holding us in a close embrace, so that we all stood within the triangle formed by the three bits ...

— The Infra-Medians • Sewell Peaslee Wright

... on three small rubber-tired wheels, placed in the form of a triangle. Thus it was an easy matter to roll the big machine from the shed to the level field beyond. Then Tom ran back and procured some stakes, several ropes, and a hammer, and soon he had the biplane staked fast to the ground, after the manner of a ...

— The Rover Boys in the Air - From College Campus to the Clouds • Edward Stratemeyer

... works was on the land side, along the base of the peninsular triangle on which the town stood. This front, about twelve hundred yards in extent, reached from the sea on the left to the harbor on the right, and consisted of four bastions with then-connecting curtains, the Princess's, the Queen's, ...

— Montcalm and Wolfe • Francis Parkman

... treated separately, covered with a decoration peculiar to itself, a fretwork of the richest kind, in which animal and vegetable forms are most happily intermingled. In one a vase of an elegant shape stands midway in the triangle at its base; two doves are seated on it, back to back; from between them rises a vine, which spreads its luxuriant branches over the entire compartment, covering it with its graceful curves and abundant fruitage; on either ...

— The Seven Great Monarchies Of The Ancient Eastern World, Vol 7. (of 7): The Sassanian or New Persian Empire • George Rawlinson

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