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Definitions for: Triangle
[n] a percussion instrument consisting of a metal bar bent in the shape of an open triangle
[n] any of various triangular drafting instruments used to draw straight lines at specified angles
[n] a three-sided polygon
Webster (1913) Definition: Tri"an`gle, n. [L. triangulum, fr. triangulus
triangular; tri- (see Tri-) + angulus angle: cf. F.
triangle. See Angle a corner.]
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 (Zo["o]l.), a small American spider
(Hyptiotes Americanus) of the family Ciniflonid[ae],
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.
Synonyms: trigon, trilateral
See Also: acute triangle, acute-angled triangle, cuneus, drafting instrument, equiangular triangle, equilateral triangle, isosceles triangle, oblique triangle, obtuse triangle, obtuse-angled triangle, percussion instrument, percussive instrument, polygon, polygonal shape, right triangle, right-angled triangle, scalene triangle, wedge, wedge shape
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