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- Triangle - n. - A figure bounded by three lines, and containing three angles.
- Triangle - 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.
- Triangle - n. - A draughtsman's square in the form of a right-angled triangle.
- Triangle - 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.
- Triangle - n. - A small constellation situated between Aries and Andromeda.
- Triangle - n. - A small constellation near the South Pole, containing three bright stars.
- Triangled - a. - Having three angles; triangular.
- Cepheus - n. - A northern constellation near the pole. Its head, which is in the Milky Way, is marked by a triangle formed by three stars of the fourth magnitude. See Cassiopeia.
- Triquadrantal - a. - Having three quadrants; thus, a triquadrantal triangle is one whose three sides are quadrants, and whose three angles are consequently right angles.
- Hypothenuse - n. - The side of a right-angled triangle that is opposite to the right angle.
- Pyramid - n. - The game of pool in which the balls are placed in the form of a triangle at spot.
- Transmutation - n. - The change or reduction of one figure or body into another of the same area or solidity, but of a different form, as of a triangle into a square.
- Cone - n. - A solid of the form described by the revolution of a right-angled triangle about one of the sides adjacent to the right angle; -- called also a right cone. More generally, any solid having a vertical point and bounded by a surface which is described by a straight line always passing through that vertical point; a solid having a circle for its base and tapering to a point or vertex.
- Revolution - n. - The motion of a point, line, or surface about a point or line as its center or axis, in such a manner that a moving point generates a curve, a moving line a surface (called a surface of revolution), and a moving surface a solid (called a solid of revolution); as, the revolution of a right-angled triangle about one of its sides generates a cone; the revolution of a semicircle about the diameter generates a sphere.
- Spider's web - - The silken web which is formed by most kinds of spiders, particularly the web spun to entrap their prey. See Geometric spider, Triangle spider, under Geometric, and Triangle.
- Acute-angled - a. - Having acute angles; as, an acute-angled triangle, a triangle with every one of its angles less than a right angle.
- Spherograph - n. - An instrument for facilitating the practical use of spherics in navigation and astronomy, being constructed of two cardboards containing various circles, and turning upon each other in such a manner that any possible spherical triangle may be readily found, and the measures of the parts read off by inspection.
- Transversal - n. - A straight line which traverses or intersects any system of other lines, as a line intersecting the three sides of a triangle or the sides produced.
- Orthocenter - n. - That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect.
- Subtend - v. t. - To extend under, or be opposed to; as, the line of a triangle which subtends the right angle; the chord subtends an arc.
- Scalene - n. - A triangle having its sides and angles unequal.
- Oxygon - n. - A triangle having three acute angles.
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- H7991 שָׁלִישׁ - 7991 שָׁלִישׁ - שָׁלִישׁ - - shâlîysh - shaw-leesh' - or שָׁלוֹשׁ; (1 Chronicles 11:11; 1 Chronicles 12:18), or שָׁלֹשׁ; (2 Samuel 23:13), from שָׁלוֹשׁ; a triple, i.e. (as a musical instrument) a triangle (or perhaps rather threestringed lute); also (as an indefinite, great quantity) a three-fold measure (perhaps a treble ephah); also (as an officer) a general of the third rank (upward, i.e. the highest); captain, instrument of musick, (great) lord, (great) measure, prince, three (from the margin). - Noun Masculine - heb