THESAURUS
O, ambit, annular muscle, annulus, areola, aureole, border, boundaries, boundary, bounds, bourns, chaplet, circle, circuit, circumscription, circus, closed circle, compass, confines, coordinates, corona, coronet, cortex, covering, crown, crust, cycle, diadem, discus, disk, edges, envelope, epidermis, eternal return, exterior, external, facade, face, facet, fairy ring, fringe, fringes, front, garland, glory, halo, integument, lasso, limitations, limits, lineaments, logical circle, loop, looplet, magic circle, marches, margin, metes, metes and bounds, noose, orbit, outer face, outer layer, outer side, outer skin, outline, outlines, outside, outskirts, pale, parameters, perimeter, periphery, radius, rim, rind, ring, rondelle, round, roundel, saucer, shell, skin, skirts, sphincter, superficies, superstratum, surface, top, verges, vicious circle, wheel, wreath
ROGET THESAURUS
Outline
N
outline,
circumference, perimeter, periphery, ambit, circuit, lines tournure, contour, profile, silhouette, bounds, coast line, zone, belt, girth, band, baldric, zodiac, girdle, tyre, cingle, clasp, girt, cordon, circlet.