Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

bend; fold &c 258; notch &c 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 &c (perpendicular) 216.1, 212; obliquity &c 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. V. bend, fork, bifurcate, crinkle. Adj. angular, bent, crooked, aduncous†, uncinated†, aquiline, jagged, serrated; falciform†, falcated†; furcated†, forked, bifurcate, zigzag; furcular†; hooked; dovetailed; knock kneed, crinkled, akimbo, kimbo†, geniculated†; oblique &c 217. fusiform [Micro.], wedge-shaped, cuneiform; cuneate†, multangular†, oxygonal†; triangular, trigonal†, trilateral; quadrangular, quadrilateral; foursquare; rectangular, square, multilateral; polygonal &c n.; cubical, rhomboid, rhomboidal, pyramidal.