quadrilateral

[kwod-ruh-lat-er-uhl]
adjective
1.
having four sides.
noun
2.
a plane figure having four sides and four angles.
3.
something of this form.
4.
Geometry.
a.
a figure formed by four straight lines that have six points of intersection.
b.
a polygon with four sides.
5.
the space enclosed between and defended by four fortresses.

Origin:
1640–50; < Latin quadrilater(us) four-sided + -al1. See quadri-, lateral

quadrilaterally, adverb
quadrilateralness, noun
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World English Dictionary
quadrilateral (ˌkwɒdrɪˈlætərəl)
 
adj
1.  having or formed by four sides
 
n
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 10th Edition
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Etymonline
Word Origin & History

quadrilateral
1650, from L. quadrilaterus, from quadri- "four" + latus (gen. lateris) "side" (see oblate (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
quadrilateral   (kwŏd'rə-lāt'ər-əl)  Pronunciation Key 
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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Example sentences
It is not a parallelogram, for it is not a right-lined quadrilateral figure.
The good news is that the quadrilateral world, for all its power struggles, is unlikely to resort to all-out war.
Their cardinal positions and the quadrilateral symmetry seemed to say that nothing else would be permitted to go in those spaces.
For a cyclic quadrilateral, the exterior angle is equal to the interior opposite angle.
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