QUADRILATERAL

quadrilateral, four-sided

(adjective) having four sides

quadrilateral, quadrangle, tetragon

(noun) a four-sided polygon

Source: WordNet® 3.1

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Etymology

Noun

quadrilateral (plural quadrilaterals)

A polygon with four sides.

An area defended by four fortresses supporting each other.

Hyponyms

• See also quadrilateral

Adjective

quadrilateral (not comparable)

Having four sides.

Source: Wiktionary

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Quad`ri*lat"er*al, a. Etym: [L. quadrilaterus: cf. F. quadrilatère, quadrilatéral. See Quadri- and Lateral.]

Definition: Having four sides, and consequently four angles; quadrangular.

Quad`ri*lat"er*al, n.

1. (Geom.)

Definition: A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.

2. An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano. Complete quadrilateral (Geom.), the figure made up of the six straight lines that can be drawn through four points, A., B, C, I, the lines being supposed to be produced indefinitely.

Source: Webster’s Unabridged Dictionary 1913 Edition

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