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

247. [Simple circularity.] Circularity — N. circularity, roundness;

rotundity &c 249. circle, circlet, ring, areola, hoop, roundlet†, annulus, annulet†, bracelet, armlet; ringlet; eye, loop, wheel; cycle, orb, orbit, rundle, zone, belt, cordon, band; contrate wheel†, crown wheel; hub; nave; sash, girdle, cestus†, cincture, baldric, fillet, fascia, wreath, garland; crown, corona, coronet, chaplet, snood, necklace, collar; noose, lasso, lassoo†. ellipse, oval, ovule; ellipsoid, cycloid; epicycloid [Geom.], epicycle; semicircle; quadrant, sextant, sector. sphere &c 249. V. make round &c adj.; round. go round; encircle &c 227; describe a circle &c 311. Adj. round, rounded, circular, annular, orbicular; oval, ovate; elliptic, elliptical; egg-shaped; pear-shaped &c 245; cycloidal &c n.†; spherical &c 249. Phr. I watched the little circles die [Tennyson].