Definition of quadrilateral
What does the word quadrilateral mean?
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part of speech: noun
[L.] A name applied to countries forming a sort of square, guarded by four fortresses, as the Q. of Peschiera, Verona, Legnano, and Mantua.
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part of speech: noun
[L.] Geom.) A plane figure bounded by four straight lines. If no two sides are parallel, it is a Trapezium; if it has only one pair of sides parallel, it is a Trapezoid; if it has two pairs of parallel sides, a Parallelogram, which is a rectangle or oblong when its angles are right angles, and a square if the four sides are equal and the angles right angles; if the four sides are equal but the angles not right angles, it is a Rhombus. See Rhomboid.
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