quadrilateral

[ kwod-ruh-lat-er-uh l ]
/ ˌkwɒd rəˈlæt ər əl /

adjective

having four sides.

noun

a plane figure having four sides and four angles.
something of this form.
Geometry.
  1. a figure formed by four straight lines that have six points of intersection.
  2. a polygon with four sides.
the space enclosed between and defended by four fortresses.

Origin of quadrilateral

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

Related forms

quad·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. 2019

Examples from the Web for quadrilateral

British Dictionary definitions for quadrilateral

quadrilateral

/ (ˌkwɒdrɪˈlætərəl) /

adjective

having or formed by four sides

noun

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

Science definitions for quadrilateral

quadrilateral

[ kwŏd′rə-lătər-əl ]

A polygon that has four sides, such as a rectangle or rhombus.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.