barn, bend, boss, brim, cam, crook, disc, disk, dot, gird, hoop, knob, lei, point, punch, reel, rim, ring, roll, round, screw, stir, stirred, stud, swirl, thread, track, turn, weave, wheel, whirl, wind, wipe, wreath, yurt

around, atoll, banjo, chaplet, circle, circus, closed-chain, closed-ring, conic, dartboard, dart board, dial, discoid, disklike, drive in, eddy, ellipse, garland, gas ring, key ring, laager, lager, lunette, maelstrom, muzzle, newel, oval, peaked cap, pie chart, pinwheel, puncher, revolve, ringworm, rivet, rosette, roundhouse, roundworm, round file, saucer, sea mat, sea moss, spot-weld, spotweld, stuffer, sunburst, sunray, tread-wheel, treadmill, treadwheel, trepan, viroid, vortex, wander, wheel tree, whirlpool

circle round, coronal, curtain ring, data track, discoidal, encircle, great circle, gun muzzle, interleave, mandala, meander, medallion, napkin ring, pass over, polka dot, pylorus, radius, rose window, rotunda, round table, scottish reel, service cap, tinea, towel ring, turntable, virusoid, yachting cap, zodiac

areola, bryozoan, canal of schlemm, cappelletti, catherine wheel, circle around, circular-knit, circularize, circularly, circumduction, conic section, cyclophorus, fenestella, firewheel tree, holding pattern, hooded sheldrake, hyperbola, monopteral, moss animal, orbicular, orbiculate, panopticon, parabola, polyzoan, portable saw, ravioli, revolve around, ring of color, sheep polypore, trephination

eccentricity, hooded merganser, martello tower, oeil de boeuf, orbiculate leaf

annular scotoma, genus cyclophorus

albatrellus ovinus, geosynchronous orbit, lophodytes cucullatus, sinus venosus sclerae