a. Obs. rare. [ad. late L. quadrilater-us, f. quadri- QUADRI- + later- stem of latus side. Cf. F. quadrilatère (a 1554).] = next.
1570. Billingsley, Euclid, I. xxi. 31. Wherefore this present figure … is a quadrilater triangle.
1571. Digges, Pantom., II. xvii. O ij b. The figure signified by the quadrilater superficies ABGF.
