A parallelogram with four right angles.

Roget 95: quaternity^†, four, tetrad, quartet, quaternion, square, quarter.    [planar form with four sides] tetract^†, tetragon, quadrangle, rectangle.    [three dimensional object with four surfaces] tetrahedron.    quadrature, quadrifoil, quadriform, quadruplet; quatrefoil.    [object or animal with four legs] tetrapod.    [geographical area with four sides] quadrangle, quad [Coll.].    [electromagnetic object] quadrupole.    [four fundamental studies] quadrivium.    ... show more

Roget 244: angularity, angularness^†; aduncity^†; angle, cusp, bend; fold etc. 258; notch etc. 257; fork, bifurcation.    elbow, knee, knuckle, ankle, groin, crotch, crutch, crane, fluke, scythe, sickle, zigzag, kimbo^†, akimbo.    corner, nook, recess, niche, oriel [Arch.], coign^†.    right angle etc. (perpendicular) 216.1, 212; obliquity etc. 217; angle of 45 degrees, miter; acute angle, obtuse angle, salient angle, reentering angle, spherical angle.    angular measurement, angular elevation, angular distance, angular velocity; trigonometry, goniometry; altimetry^†; clinometer, graphometer^†, goniometer; theodolite; sextant, quadrant; dichotomy.    triangle, trigon^†, wedge; rectangle, square, lozenge, diamond; rhomb, rhombus; quadrangle, quadrilateral; parallelogram; quadrature; polygon, pentagon, hexagon, heptagon, octagon, oxygon^†, decagon.    pyramid, cone.    Platonic bodies; cube, rhomboid; tetrahedron, pentahedron, hexahedron, octahedron, dodecahedron, icosahedron, eicosahedron; prism, pyramid; parallelopiped; curb roof, gambrel roof, mansard roof.    ... show more

Dutch: rechthoek
Polish: prostokąt