SG Heritage Dictionary

Cycloidal [Adjective] Webster's Dictionary 1828

Pertaining or relating to a cycloid; as, the cycloidal space is the space contained between the cycloid and its substance. Or the space contained between the curve or crooked line and the subtense of the figure.

Cycloidal [Adjective] Webster's Dictionary 1913

Pertaining to, or resembling, a cycloid; as, the cycloidal space is the space contained between a cycloid and its base.

Circularity Roget’s Thesaurus §247

N. circularity, roundness, rotundity, 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, epicycle, semicircle, quadrant, sextant, sector, sphere

V. make round, round, go round, encircle, describe a circle

Adj. round, rounded, circular, annular, orbicular, oval, ovate, elliptic, elliptical, egg-shaped, pear-shaped, cycloidal, spherical

Phr. "i watched the little circles die"