Lewis Short
quādra (noun F) :
* A square.
* In gen.: qui locus gradibus in quadram formatus est, Fest. s. v. Romanam, p. 262 Müll.
* In partic.
* In arch.
* The lowest and largest member of the base of a pedestal, the foundation-stone, socle, plinth, Vitr. 3, 3.
* A table to eat from, a dining-table (as these were usually square; cf. Varr. L. L. 5, § 118 Müll.): patulis nec parcere quadris, of the pieces of bread used as plates,Verg. A. 7, 115.— Hence, alienā vivere quadrā, to live from another's table (as a parasite), Juv. 5, 2.
* A (square) bit, piece, morsel: et mihi dividuo findetur munere quadra,Hor. Ep. 1, 17, 49: casei,Mart. 12, 32, 18: placentae,id. 6, 75, 1; 9, 92, 18: panis,Sen. Ben. 4, 29, 2.
Charlton T. Lewis, Charles Short, A Latin Dictionary