[quad.ran.gle] n [ME, fr. MF, fr. LL quadriangulum, fr. L, neut. of quadriangulus quadrangular, fr. quadri- + angulus angle] (15c) 1: quadrilateral
2. a: a 4-sided enclosure esp. when surrounded by buildings b: the buildings enclosing a quadrangle
3: a tract of country represented by one of a series of map sheets (as published by the U.S. Geological Survey) -- qua.dran.gu.lar adj