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quadrilateral
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English Dictionary: quadrilateral by the DICT Development Group
3 results for quadrilateral
From WordNet (r) 3.0 (2006) [wn]:
quadrilateral
adj
  1. having four sides
    Synonym(s): quadrilateral, four-sided
n
  1. a four-sided polygon [syn: quadrilateral, quadrangle, tetragon]
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Quadrilateral \Quad`ri*lat"er*al\, a. [L. quadrilaterus: cf. F.
      quadrilat[8a]re, quadrilat[82]ral. See {Quadri-} and
      {Lateral}.]
      Having four sides, and consequently four angles;
      quadrangular.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Quadrilateral \Quad`ri*lat"er*al\, n.
      1. (Geom.) A plane figure having four sides, and consequently
            four angles; a quadrangular figure; any figure formed by
            four lines.
  
      2. An area defended by four fortresses supporting each other;
            as, the Venetian quadrilateral, comprising Mantua,
            Peschiera, Verona, and Legnano.
  
      {Complete quadrilateral} (Geom.), the figure made up of the
            six straight lines that can be drawn through four points,
            A, B, C, I, the lines being supposed to be produced
            indefinitely.
No guarantee of accuracy or completeness!
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