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quadrilateral

[kwod-ruh-lat-er-uh l]
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adjective
  1. having four sides.
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noun
  1. a plane figure having four sides and four angles.
  2. something of this form.
  3. Geometry.
    1. a figure formed by four straight lines that have six points of intersection.
    2. a polygon with four sides.
  4. the space enclosed between and defended by four fortresses.
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Origin of quadrilateral

1640–50; < Latin quadrilater(us) four-sided + -al1. See quadri-, lateral
Related formsquad·ri·lat·er·al·ly, adverbquad·ri·lat·er·al·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

squarerectangleparallelogramquadrilateralrhombus

Examples from the Web for quadrilateral

Historical Examples

  • They form the quadrilateral wherein Daudet's fame is secure.

    The Nabob, Volume 1 (of 2)

    Alphonse Daudet

  • A quadrilateral figure that has only two of its four sides parallel.

    The Sailor's Word-Book

    William Henry Smyth

  • Thus, in the circle and the quadrilateral (the parts are not circles or quadrilaterals).

  • The walled part of the town is a quadrilateral with faces of about 1200 yds.

  • The quadrilateral Isis-headed capital, as at Denderah, was often used.

    A Manual of the Historical Development of Art

    G. G. (Gustavus George) Zerffi


British Dictionary definitions for quadrilateral

quadrilateral

adjective
  1. having or formed by four sides
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noun
  1. Also called: tetragon a polygon having four sides. A complete quadrilateral consists of four lines and their six points of intersection
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for quadrilateral

n.

"four-sided," 1640s, with -al (1) + Latin quadrilaterus, from quadri- "four" (see quadri-) + latus (genitive lateris) "side" (see oblate (n.)). As an adjective from 1650s. Related: Quadrilaterally.

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Online Etymology Dictionary, © 2010 Douglas Harper

quadrilateral in Science

quadrilateral

[kwŏd′rə-lătər-əl]
  1. A polygon that has four sides, such as a rectangle or rhombus.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.