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Definition of triangle:

  1. A draughtsman's square in the form of a right- angled triangle.
  2. A figure bounded by three lines, and containing three angles.
  3. 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.
  4. A small constellation near the South Pole, containing three bright stars.
  5. A small constellation situated between Aries and Andromeda.
  6. 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.

Synonyms:

quartet, protractor, obtuse-angled, brace, diamond, triplicity, quintet, dividers, ruler, right-angled, compasses, slide rule, chevron, scalene, flare, four, score, cross, trilateral, set square, acute-angled love, pairing, couple, cuboid, plumb line, theodolite, isosceles, duo, trigon, T-square, pair, fractal, foursome.

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