(a.) Right-angled; rectangular; as, an orthogonal intersection\ of one curve with another.

cube-shaped cubed cubic cubiform cuboid diced foursquare normal oblong orthodiagonal orthometric perpendicular plumb plunging precipitous quadrangular quadrate quadriform quadrilateral rectangular rhombic rhomboid right-angle right-angled right-angular sheer square steep straight-up straight-up-and-down tetragonal tetrahedral trapezohedral trapezoid up-and-down