O, annular muscle, annulus, areola, aureole, carousel, chaplet, circle, circuit, circumference, circus, closed circle, coat, coating, collop, corona, coronet, covering, crown, cut, cycle, deal, diadem, discus, eternal return, fairy ring, feuille, film, flap, foil, fold, garland, glory, halo, lamella, lamina, laminated glass, laminated wood, lap, lasso, leaf, logical circle, loop, looplet, magic circle, membrane, merry-go-round, noose, orbit, pane, panel, patina, peel, pellicle, plait, plank, plate, plating, ply, plywood, radius, rasher, ring, roller, rolling stone, rondelle, rotator, rotor, round, roundabout, roundel, rundle, safety glass, saucer, scum, sheet, skin, slab, slat, slice, sphincter, table, tablet, top, veneer, vicious circle, wafer, wheel, whirlabout, whirler, whirligig, wreath
exteriority, outside, exterior, surface, superficies, skin, superstratum, disk
, disc, face, facet, extrados, excentricity, eccentricity, circumjacence, exterior, external, outer most, outward, outlying, outside, outdoor, round about, extramural, extralimitary, extramundane, superficial, skin-deep, frontal, discoid, extraregarding, excentric, eccentric, outstanding, extrinsic, ecdemic, exomorphic, externally, out, with out, over, outwards, ab extra, out of doors, extra muros, in the open air, sub Jove, sub dio, a la belle etoile, al fresco.
front, fore, forepart, foreground, face, disk
, disc, frontage, facade, proscenium, facia, frontispiece, anteriority, obverse (of a medal or coin), fore rank, front rank, van, vanguard, advanced guard, outpost, first line, scout, brow, forehead, visage, physiognomy, phiz, countenance, mut, rostrum, beak, bow, stem, prow, prore, jib, pioneer, metoposcopy, fore, anterior, front, frontal, before, in front, in the van, in advance, ahead, right ahead, forehead, foremost, in the foreground, in the lee of, before one's face, before one's eyes, face to face, vis-a-vis, front a front, formosa muta commendatio est, frons est animi janua, Human face divine, imago animi vultus est indices oculi, sea of upturned faces.