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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 indefinit…

The property of being quadrilateral.

A solid bounded by twelve quadrilateral faces. It is a hemihedral form of the isometric system, allied to the tetrahedron.

Joining two not adjacent angles of a quadrilateral or multilateral figure; running across from corner to corner; crossing at an angle with one of the sides. Diagonal bond (Masonry), herringbone work. See Herringbone, a. -- Diagonal built (Shipbuilding), built by forming the outer skin of two layers of planking, making…

A solid bounded by twenty-four similar quadrilateral faces. It is a hemihedral form of the hexoctahedron.

A quadrilateral, tailless kite, with convex surfaces exposed to the wind. This kite was extensively used by Eddy in his famous meteorological experiments. It is now generally superseded by the box kite.

A quadrilateral, one of whose diagonals is an axis of symmetry. Henrici.

A right-lined quadrilateral figure, whose opposite sides are parallel, and consequently equal; -- sometimes restricted in popular usage to a rectangle, or quadrilateral figure which is longer than it is broad, and with right angles. Parallelogram of velocities, forces, accelerations, momenta, etc. (Mech.), a parallelog…

An equilateral parallelogram, or quadrilateral figure whose sides are equal and the opposite sides parallel. The angles may be unequal, two being obtuse and two acute, as in the cut, or the angles may be equal, in which case it is usually called a square.

A lake whitefish (Coregonus quadrilateralis), less compressed than the common species. It is very abundant in British America and Alaska.

ace of an octahedron. Tetragonal trisoctahedron, a trisoctahedron each face of which is a quadrilateral; called also trapezohedron and icositetrahedron. -- Trigonal trisoctahedron, a trisoctahedron each face of which is an isosceles triangle.