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quadrilateral (n.)

"figure formed of four straight lines," 1640s, with -al (1) + Latin quadrilaterus, from quadri- "four" (from PIE root *kwetwer- "four") + latus (genitive lateris) "the side, flank of humans or animals, lateral surface," a word of uncertain origin. As an adjective, "four-sided, composed of four lines," from 1650s. Related: Quadrilaterally.

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Definitions of quadrilateral from WordNet
1
quadrilateral (n.)
a four-sided polygon;
Synonyms: quadrangle / tetragon
2
quadrilateral (adj.)
having four sides;
Synonyms: four-sided
From wordnet.princeton.edu