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quadrilateral

[kwod-ruh-lat-er-uh l] /ˌkwɒd rəˈlæt ər əl/
adjective
1.
having four sides.
noun
2.
a plane figure having four sides and four angles.
3.
something of this form.
4.
Geometry.
  1. a figure formed by four straight lines that have six points of intersection.
  2. a polygon with four sides.
5.
the space enclosed between and defended by four fortresses.
Origin
1640-1650
1640-50; < Latin quadrilater(us) four-sided + -al1. See quadri-, lateral
Related forms
quadrilaterally, adverb
quadrilateralness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for quadrilaterals

quadrilateral

/ˌkwɒdrɪˈlætərəl/
adjective
1.
having or formed by four sides
noun
2.
Also called tetragon. a polygon having four sides. A complete quadrilateral consists of four lines and their six points of intersection
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
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Word Origin and History for quadrilaterals

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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quadrilaterals in Science
quadrilateral
  (kwŏd'rə-lāt'ər-əl)   
A polygon that has four sides, such as a rectangle or rhombus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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