quadrilateral

quadrilateral
    adj 1: having four sides [syn: {quadrilateral}, {four-sided}]
    n 1: a four-sided polygon [syn: {quadrilateral}, {quadrangle},
         {tetragon}]
    

Quadrilateral \Quad`ri*lat"er*al\, a. [L. quadrilaterus: cf. F.
   quadrilat[`e]re, quadrilat['e]ral. See {Quadri-} and
   {Lateral}.]
   Having four sides, and consequently four angles;
   quadrangular.
   [1913 Webster]
    

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.
      [1913 Webster]

   2. An area defended by four fortresses supporting each other;
      as, the Venetian quadrilateral, comprising Mantua,
      Peschiera, Verona, and Legnano.
      [1913 Webster]

   {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.
      [1913 Webster]
    

51 Moby Thesaurus words for "quadrilateral":
      bifacial, bilateral, biquadratic, cube-shaped, cubed, cubic,
      cubiform, cuboid, diced, dihedral, flanked, four, four-legged,
      four-rayed, foursquare, handed, lateral, many-sided, multilateral,
      oblong, one-sided, orthogonal, polyhedral, quadrangular, quadrate,
      quadric, quadriform, quadrinomial, quadrivalent, quadruped,
      quartic, quartile, quaternary, rectangular, rhombic, rhomboid,
      sided, square, tetractinal, tetrad, tetragonal, tetrahedral,
      tetravalent, three-sided, trapezohedral, trapezoid, trihedral,
      trilateral, triquetrous, two-sided, unilateral