quadrilateral

quadrilateral
—quadrilaterally, adv. —quadrilateralness, n.
/kwod'reuh lat"euhr euhl/, adj.
1. having four sides.
n.
2. a plane figure having four sides and four angles.
3. something of this form.
4. Geom.
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.
[1640-50; < L quadrilater(us) four-sided + -AL1. See QUADRI-, LATERAL]

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▪ Italian fortresses
      famous combination of four fortresses mutually supporting one another, during the Austrian rule of northern Italy. The four fortified towns were Mantua, Peschiera (Peschiera del Garda), Verona, and Legnago, lying between Lombardy and Venetia; the former two were on the Mincio and the latter two on the Adige. The real value of the Quadrilateral, which gave Austria such a firm hold on Lombardy, lay in the great natural strength of Mantua and in the readiness with which troops and supplies could be poured into Verona from Austria to the north.

      The term quadrilateral has also been applied to other similar groups of fortresses—for example, the fortresses of Namur, Liège, Maastricht, and Leuven in the old Netherlands and those of Silistra, Ruse, Shumen, and Varna in Bulgaria.

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Universalium. 2010.

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  • Quadrilateral — Quad ri*lat er*al, n. 1. (Geom.) A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines. [1913 Webster] 2. An area defended by four fortresses supporting each other; as, the Venetian …   The Collaborative International Dictionary of English

  • quadrilatéral — ● quadrilatéral, quadrilatérale, quadrilatéraux adjectif Qui a quatre côtés. quadrilatéral, ale, aux [kwadʀilateʀal, o; kadʀilateʀal, o] adj. ÉTYM. 1556; de quadrilatère, ou lat. quadrilaterus. ❖ ♦ Didact …   Encyclopédie Universelle

  • Quadrilateral — Quad ri*lat er*al, a. [L. quadrilaterus: cf. F. quadrilat[ e]re, quadrilat[ e]ral. See {Quadri } and {Lateral}.] Having four sides, and consequently four angles; quadrangular. [1913 Webster] …   The Collaborative International Dictionary of English

  • Quadrilaterāl — (lat.), vierseitig …   Meyers Großes Konversations-Lexikon

  • quadrilatéral — quadrilatéral, ale (koua dri la té ral, ra l ) adj. Qui offre quatre côtés. ÉTYMOLOGIE    Quadri..., et latéral …   Dictionnaire de la Langue Française d'Émile Littré

  • quadrilateral — (n.) 1650, from L. quadrilaterus, from quadri four (see QUADRI (Cf. quadri )) + latus (gen. lateris) side (see OBLATE (Cf. oblate) (n.)) …   Etymology dictionary

  • quadrilateral — adj. 2 g. Que tem quatro lados …   Dicionário da Língua Portuguesa

  • quadrilateral — ► NOUN ▪ a four sided figure. ► ADJECTIVE ▪ having four straight sides …   English terms dictionary

  • quadrilateral — [kwä΄dri lat′ər əl] adj. [< L quadrilaterus (see QUADRI & LATERAL) + AL] four sided n. 1. Geom. a plane figure having four sides and four angles 2. a four sided area quadrilaterally adv …   English World dictionary

  • Quadrilateral — This article is about four sided mathematical shapes. For other uses, see Quadrilateral (disambiguation). Quadrilateral Six different types of quadrilaterals Edges and vertices 4 …   Wikipedia

  • quadrilateral — UK [ˌkwɒdrɪˈlæt(ə)rəl] / US [ˌkwɑdrɪˈlæt(ə)rəl] noun [countable] Word forms quadrilateral : singular quadrilateral plural quadrilaterals maths a flat shape with four sides such as a square Derived word: quadrilateral UK / US adjective …   English dictionary

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