parallelogram

corrugation, concavity, nosepiece, waviness, tubercle, lamella, dihedral, bevels, dodecahedron, toroid, commissure, serrations, volute, conic, crosshatch, talar, chamfer, condyles, striation, stroboscope, swage, trabeculae, acromion, watchcase, curvatures, pedicle, angulation, rhomboids, frustum, contour, punctate, convex lens, diffraction grating, checkering, dorsum, convex, octahedron, roughening, flanging, undulant, lateral epicondyle, ileocecal valve, laminae, polyhedron, aerofoil, indention, capsulotomy, plasty, lunate, ringlet, isosceles, chine, fingerlike, helixes, martensite, tailstock, endplate, parallelogram, tubelike, gnomon, sawtooth, condylar, labia majora, extensor, pelvic girdle, mesial, lunette, piston rod, semicircles, rhombus, flexure, formes, pintle, oculi, papule, luxation, auricle, strakes, exostosis, pentaprism, ostia, ellipsoid, fontanelle, obturator, sulci, wavelike, synovial, phalanges, soleplate, concentricity, maxilla, gluteus medius, anklebone, sinistral, venturi, toroidal, tensional, wavelets, auditory canal, pectoralis major, caudal fin, spermatic cord, triangle, trapezoid, hexagon, rectangle, quadrilateral, pentagon, triangles, cone, quadrangle, tetrahedron, horseshoe, octagon, square, triangular, diagonal, ellipse, fin, oval, quad, ankle, clavicle, hinge, hip, interphalangeal, scaphoid, trapezial, acetabular, acromial, apophyseal, arm, atlas, basal, basilar, bayonet, brittle, calcaneal

os trapezoideum, trapezoid, trapezoid bone

carpal, carpal bone, quadrangle, quadrilateral, tetragon, wrist bone

os trapezium, trapezium bone