Quadrilatʹeral
.The four fortresses of Peschieʹra and Mantua on the Mincio, with Veroʹna and Legnaʹgo on the Adʹigë. Now demolished.
The Prussian Quadrilateral. The fortresses of Luxemburg, Coblentz, Sarrelouis, and Mayence.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.